Apple mac os x 10.6 snow leopard family pack

Grand Central Dispatch uses the multiple processor cores now in every new Macintosh for more efficient performance. Due to the technical difficulties traditionally involved in making applications optimized for multicore CPUs, the majority of computer applications do not effectively use multiple processor cores.

Grand Central Dispatch includes APIs to help programmers efficiently use these cores for parallel programming. Grand Central Dispatch shifts thread handling focus to itself rather than leaving it to specific applications to distribute jobs evenly across cores and clears up unused memory created by inactive or old threads to achieve maximum performance.

Apple is also releasing APIs for Grand Central Dispatch for developers to use in their applications and also to analyze specific blocks of code running on Grand Central Dispatch. A new C and Objective-C language feature named " Blocks " facilitates creation of code that will easily optimize to take advantage of Grand Central Dispatch. OpenCL Open Computing Language addresses the power of graphics processing units GPUs to leverage them in any application, and not just for graphics-intensive applications like 3D games.

OpenCL automatically optimizes for the kind of graphics processor in the Mac, adjusting itself to the available processing power. OpenCL provides consistent numeric precision and accuracy, fixing a problem that has hampered GPU-based programming in the past. Only the most process intensive parts of the application need to be written in OpenCL C without affecting the rest of the code. It only works with the following Mac GPUs: CUPS the printing system used in many Unix-like operating systems has been updated to version 1. CUPS 1. Power management has been improved, with implementation of a new wake on demand feature supported on more recent Macintosh hardware.

Should the request require the host computer to wake up , the router sends the necessary special wake-up-packet [50] to the sleeping computer. The Safari web browser has received updates to version 6. Snow Leopard breaks compatibility with several older versions of some applications, such as Parallels Desktop 3.

Printer and scanner drivers used by previous versions of Mac OS X are not compatible with Snow Leopard and will be replaced during Snow Leopard installation. Since the initial release of Snow Leopard many manufacturers have provided compatible drivers that are available via Software Update. Engadget's opinion was that this could be largely because most users would not see a noticeable change in the look and feel of the system. CNET editors gave it 4 stars out of 5, stating "Intel Mac users will like Snow Leopard's smartly designed interface enhancements, and its Exchange support is a must-have especially with Outlook for Mac on the way.

On October 21, , SFGate blogger Yobie Benjamin wrote that the "MacBook Pro that came preloaded with Snow Leopard kicks butt and is a screaming fast machine", but "when I tried to upgrade one of my 'older' MacBooks, it was a fricking disaster from hell". Apart from upgrading, Benjamin also tried a clean install. But he complained of slowness even after his clean install.

He wrote, "I ended up downgrading back to OSX If you want to roll the dice and try, go ahead Lesson learned I'll wait. Mac OS X Server includes these features and other server-related features. Apple initially stated that Server would include ZFS support, but mention of this feature later disappeared from Apple's website and it was not included in the final release due to licensing issues. It's a 3. From Wikipedia, the free encyclopedia. Mac OS X Macintosh Unix [1]. Rhapsody Developer Release Hera Server 1.

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All Mac notebooks with Multi-Touch trackpads now support three- and four-finger gestures. Archived from the original on July 20, Retrieved June 11, October 22, Archived from the original on May 21, Retrieved October 22, Archived from the original on October 27, Retrieved October 23, CBS Interactive. Archived from the original on August 10, Archived from the original on April 16, Retrieved April 13, Minimize windows to App icon and Expose". June 27, Retrieved August 29, Archived from the original on July 22, June 19, Archived from the original on December 7, Mac — Printing".

April 29, Archived from the original on August 4, Retrieved August 21, November 13, Retrieved November 16, September 6, Retrieved March 17, Archived from the original on November 12, Macs that use the bit kernel". Retrieved September 6, Starting up with the bit or bit kernel". August 27, Archived from the original on December 5, Mac OS X Internals: The Blog. The New York Times. Archived from the original on January 11, Apple responds quickly to online threats and automatically delivers security updates directly to your Mac.

Thanks to its versatility and power, OS X is compatible with almost any computing environment, including Windows networks. It works with all of today's digital cameras, printers, and other peripherals without the need to manually download separate drivers.

Apple Snow Leopard Overview

If you need to run Windows, your Mac can do that too. Snow Leopard is the only operating system with built-in support for the latest version of Microsoft Exchange Server, allowing you to use your Mac at home and at work, with all of your messages, meetings, and contacts in the same place. OS X comes standard with a wide range of assistive technologies that help people with disabilities experience what the Mac has to offer, including many features you won't find in other operating systems. The integrated VoiceOver screen-reading technology makes it possible for those who are blind or have low vision to control their computer using key commands or gestures on a Multi-Touch trackpad.

OS X also offers out-of-the-box support for more than 40 Braille displays, including Bluetooth displays. It supports many other accessibility features, including dynamic full-screen magnification, playback of closed captions, and a scalable screen. Snow Leopard is built on the same reliable UNIX foundation that powers industrial-strength servers, helping to ensure that your computing experience is free of system crashes and compromised performance.

Even upgrading your Mac to the next version of OS X is reliable and easy. It checks your applications, setting aside programs that are known to be incompatible. If a power outage interrupts your installation, it can start again without losing any data. Upgrading does not require reformatting your drive, allowing you to keep all of your compatible applications, files, and settings. If something goes wrong when you're using your Mac, Time Machine is there, keeping automatic backups of everything on your drive.

OS X comes in a single, full-featured version that includes a large collection of beautifully designed applications. They not only let you surf the web, conduct video and text chats, manage your contacts, and accomplish other day-to-day tasks, they also work together to make you more productive and let you have more fun. Finder makes working with your files and documents as easy as browsing your iTunes library. Located at the bottom of your screen by default, the Dock gives you quick access to your most frequently used applications, files, and folders. Using visually appealing, high-resolution icons, the Dock itself begs to be clicked.

When you do, applications spring to life in an instant. A bright signal beacon sits beneath open applications to let you know that they are running at a glance. You can set the Dock to remain at the bottom of your screen, framing your desktop picture and always visible. It can also be set to tuck itself away automatically, ready to return when you move the pointer to the bottom of your screen. The Dock comes loaded with icons for many applications that are included with your Mac - Dashboard, Mail, iCal, iPhoto, and many more.

However, it's easy to customize to suit your needs. To add a new application or folder, just grab it from the Finder and move it onto the Dock. The Dock will expand to make room for the new item, and if you have a lot of icons, they will automatically scale to fit on your desktop. To make icons easy to identify, they can be set to magnify as you move your mouse over them. Removing and rearranging items is just as simple: A stack is a Dock item that gives you fast, direct access to folders and files.

When you click a stack, the files within spring from the dock in a fan or a grid, depending on the number of items or preference that you set. Mac OS X starts you off with premade stacks for downloads, applications, and documents. The Downloads stack automatically captures files you download from Safari, Mail, and iChat. The Applications stack gives you fast access to all your applications. The Documents stack is a great place to keep things like presentations, spreadsheets, and word processing files.

The files in each stack can appear as large icons that preview their contents, so it's easy to find the right file before your click. Stacks are scrollable, so you can easily view all items. You can navigate through folders in a stack to see all the files inside the stack. Create as many stacks as you wish simply by dragging folders to the right side of your Dock.

With the clutter cleared away, you can easily find the document that you need. A click makes it the active window, and pressing the space bar gives you a full-screen preview of the windows. When you drag a file onto a Dock icon, all of the open windows in the application pop up, allowing you to place the file into the right window, perfect for those times when you'd like to attach a file to an e-mail message. The Finder is the home base for your Mac.

Represented by a blue icon with a smiling face, it's one of the first things you'll see when you start working on a Mac. Finder lets you organize and access practically everything on your Mac, including applications, files, folders, discs, and shared drives on your network. You can also see rich, high-quality previews of the contents of your files. Finder takes full advantage of the advanced technologies in Mac OS X, including bit support and Grand Central Dispatch, responding quickly to your actions. The sidebar in the Finder window is your starting point when browsing your Mac.

You'll be able to locate frequently accessed folders, CDs, DVDs, network computers, and the like via the sidebar. With a few clicks, you'll be on the way to finding what you need. The sidebar also features a handy Search For section, which uses Spotlight search to find files that you've modified today, yesterday, or in the past week. It can also find images, movies, or documents. Click on a folder and you'll see an up-to-the-minute lists of files contained within.

Just like the Dock, you can customize the sidebar with your own search folders. Any Mac or PC in your home network automatically appears on the sidebar. This allows you to easily share files between them, and use Spotlight search and Cover Flow to search network computers. When you click a connected Mac, you can use screen sharing, which lets you see and control another Mac as if you were sitting in front of it.

This is useful, for example, when you want to show someone how to use an application or feature. Using Cover Flow, you can flip through documents as easily as you flip through music in iTunes or bookmarks in Safari 4. Each file is displayed as a large preview of its first page, so you can actually see the contents of a document before opening it.

You'll also be able to look at files in a list view, which allows you to sort them in different ways, including by file name, date modified, or file type. You can see them in multiple column view, which lets you navigate through multiple folders with ease. Finally, you can view them as large icons, up to x pixels in size. Icon view lets you thumb through a multipage document or watch a QuickTime movie right in Finder, speeding your ability to find and view your files.

It unshuffles overlapping windows on your desktop, placing them in an organized thumbnail view. You'll be able to quickly locate and switch to any window, or get to any file on your desktop with ease. It preserves the visual quality of each reduced-size window, ensuring that you can identify its contents with ease.

If a full-screen preview is required, simply press the Space bar. As you move from one tiled window to the next, you'll see the title displayed at the bottom of the window. When you find the window you need, just click it. Magically, every window returns to full size, and the window you clicked is brought to the front of your desktop and made active.

With a single key press, all open windows push to the side of your screen, revealing your desktop. Simply grab the item that you need and another keypress will bring the windows back to their original locations. You can use this to check and see if a CD or DVD that is burning in the background has completed, or if you need locate and drag a file into an e-mail as an enclosure. A click makes it the active window, pressing the Space bar gives you a full-screen preview of the window.

If you prefer keyboard shortcuts, you can tile application windows with a keystroke too. Simply drag a file onto the icon of an open application and its windows will tile, allowing you to place the file into the window that you desire. Flip through multipage PDFs and Microsoft Office documents, watch full-screen video, view photo slideshows, and more: Quick Look is the innovative technology that gives you a sneak peek of entire files, even multiple-page documents and video, without opening them. All you have to do is select a file in Finder and press the Space bar.

An elegant transparent window appears, showing you the contents of the file instantly. It's great when you're looking for something specific, but don't have time to open lots of files to find it. Quick Look works with nearly every file on your system, including images, text files, PDFs, movies, Keynote presentations, Mail attachments, and Microsoft Office documents.

You can view the file in full screen, and you can open the application that created it with a double-click. Best of all, Quick Look works even if you don't have the application that created it, perfect for those times when a colleague sends you a file that you could not otherwise open.

You can use Quick Look to your advantage when searching for files to restore via Time Machine.

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Once you locate the file you are looking for, you can use Quick Look to verify its contents before restoring it to your desktop. Quick Look also works in Mail and iChat, allowing you to preview attachments before they are downloaded. Perfect for viewing attached PDFs and Office Documents, you can even view attached photos as a slideshow and add them to your iPhoto library with ease.

Because it's built into the core of Mac OS X, search results update instantly whenever files change. Spotlight is the lightning-fast search technology that is built into Mac OS X. It makes it easy to find what you are looking for, even if you don't know where it's stored on your computer.

Conveniently located in the OS X menu bar, the Spotlight search field gives you instant results as you start typing. It searches through files, folders, documents, Mail messages, Address Book contacts, iCal calendars, System Preferences, applications, and dictionary definitions. Spotlight searches aren't confined to your computer, you can also search other computers on your network. Built into the core of OS X, Spotlight can deliver search results quickly because it indexes files on your computer as a background process.

When you make a change, such as adding a new file, e-mail, or contact, Spotlight automatically updates its index, ensuring that you receive up-to-the-moment search results. Spotlight is more than a simple search engine. Its index stores information on metadata contained within supported files: These include the type of content, author, edit history, format, size, and too many other details to list in this space. Most document types, including Microsoft Word documents, Adobe Photoshop images, and e-mail contain rich metadata.

Because Spotlight indexes content as well, search results include what appears inside a file or document, not just its title. When you click the document, you are immediately taken to the spot in the document with the search terms highlighted. Thanks to its speed and flexibility, Spotlight opens up countless new ways for you to organize your files. You can save the results of a search as a Smart Folder that automatically updates as you add, change, or remove documents on your Mac.

Apple's Mac OS X 10.6 Snow Leopard to retail for $29 in September

Smart Folders contain files grouped together based on search criteria instead of physical location, allowing the same file to appear in multiple Smart Folders without moving from its original saved location on your system. There is no need to duplicate, shift, or update files: Spotlight Smart Folders keep everything organized for you.

Regardless of which application you search, results will appear immediately after you start typing a few letters. As your search is customizable, you'll be able to restrict your search to selected mailboxes or fields in Mail if you desire. In Address Book, you'll be able to search your entire contact list, or only select groups. It is both fast and easy-to-use, sporting a simple, elegant interface and support for the latest Internet standards.

Safari does not stand in the way of your enjoyment of the web. Faster than other browsers on the market, Safari delivers blazingly fast performance thanks to its Nitro Engine. Safari also offers top-flight HTML performance, the best on any platform, loading pages up to 3 times faster than Internet Explorer 8 and almost 3 times faster than Firefox 3.

You'll spend more time browsing the web and less time waiting for pages to load.

Apple WWDC 2009 - Mac OS X Snow Leopard Introduction

Sporting a clean, elegant look, Safari allows you to focus on what matters: The features that you use most are a mere click away, and the integrated Google search bar makes it easy to find what you're looking for. Running Safari 4 on Snow Leopard makes it even more resistant to crashes than it was on Leopard. Most crashes in Mac OS X are caused by web browser plug-in crashes. Apple engineers redesigned Safari to make plug-ins run separately from the browser. If a plug-in crashes on a web page, Safari keeps running. Simply refresh the page and get going again.

Safari allows you to view your browsing history in a dramatic new way: The sites appear exactly as you did when you last visited them, and you can flip through the results using the familiar Cover Flow interface. The Top Sites feature shows you a stunning at-a-glance preview of your favorite web sites. Safari tracks which sites you visit and ranks your favorites, presenting up to 24 thumbnails on a single page, all of which are accessible with a single click. You can customize the display by pinning a favorite site to a specific location in the grid. A star in the upper right of each thumbnail indicates whether a site has added new content since last you visited.

Supporting the latest standards for secure access and information sharing on the web, Safari protects you both at home and when you're browsing on a public computer. It features integrated antiphishing technology that detects fraudulent websites and warns you before displaying information. It supports EV Extended Validation certificates, allowing you to feel confident shopping, updating account information, or paying bills online. Integrated parental controls allow you to protect your children as they explore the web. Using the same technology that keeps spam out of your inbox, a content filter takes a quick peek at websites before they load, attempting to determine if they're suitable for young eyes.

If they are not, Safari blocks them from being viewed.

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You can override this filter by creating lists of specific websites that you want, or don't want, your children to see. These controls must be enabled to function, by default they are turned off, offering mature users unhindered access to the web. They bring the power of Mac OS X to your e-mail, calendar, and contacts. They feature elegant, easy-to-use interfaces, lightning-fast searches, and compete integration across the applications and your Mac.

Designed from the ground up specifically for e-mail, Mail features an elegant user interface that makes it easy to manage all of your e-mail from a single, ad-free inbox, even when you are not connected to the Internet. Mail, and AOL Mail. It can access multiple e-mail accounts with ease, allowing you to manage all of your messages from a single program. Thanks to Mail, Snow Leopard is the only operating system with built-in support for the latest version of Microsoft Exchange Server.

You can use your Mac, complete with all of the features and applications that you love, at home and at work with all of your messages, meetings, and contacts in a central location. Mail does much more than simply display e-mail messages. It analyzes the contents to help you act on them. If you receive an invitation, Mail allows you to add it to your calendar with ease -- even if such language as "today" or "tomorrow" is used in place of a date.

If a location is listed in the invitation, you can click the address to view a Google map of the address. If a message includes a phone number of e-mail address, it can be added to your Address Book with a click. An intelligent mail filter automatically identifies and catches messages that Mail thinks are junk. This mail is placed in a special folder, ensuring that your inbox is not clogged with spam. If a junk message does get through, simply click the Junk button, and from then on, similar e-mail will also be placed in the Junk folder.

The more you train Mail to recognize junk mail, the better it gets. Address Book is a flexible and convenient application that stores contact information for your friends, family, and colleagues. You can import information from other applications, create distribution lists for clubs and groups, print address labels and envelopes, and more. Because Address Book is built on the industry-standard vCard format for storing contact information, your friends can send your cards that can be added to your Address Book via drag and drop: Address Book can do more than simply display card contents; it also lets you use them.

Click an address to ask the web for a Google map showing the location. Click a URL to open the website. Click an e-mail address to instantly send a message or start an iChat conversation. You'll be able to create separate calendars for home, school, work, and so on.

You can see all of your calendars in a single view, or choose to see only the calendars you want. You can use iCal to invite friends and family to events. You'll be able to create invitations using contact information from your Address Book, update your guest list, keep track of attendee responses, and receive the latest status information. A centralized notification box keeps all your invitations and responses in one location so you can manage events in iCal instead of your busy e-mail inbox. When you or another Mac user receives an iCal invitation in Mail, it's automatically added to iCal.

Spotlight allows you to more easily find information in Mail, iCal, and Address Book. You can use it to search within the applications, including all fields in an e-mail, and all information on a card or appointment, ensuring that you find every possible match. If you're not using the applications, you can still find messages, contacts, and appointments by using Spotlight search in the main OS X menu bar. Start typing a search term and Spotlight returns the related items immediately.

Spotlight technology also helps you organize your mail and contacts by using Smart Groups and Smart Mailboxes. Simply select the relevant criteria, for example, every contact with a birthday in the next 30 days or every e-mail sent by your boss, and your applications will create a folder containing every item that meets your criteria. Folders stay updated as new items are created, ensuring that they stay current. Mail and iCal use the contacts from Address Book, allowing you to send messages or invitations to individuals and groups.

Mail can access your iPhoto library, making it easy to e-mail pictures to your friends and family. If you receive an attachment, Mail lets you use Quick Look to view its contents, without having to save the attachment and launch another application.

Mac OS X 10.6.3 Snow Leopard (Family Pack)

Part of what makes Address Book and iCal so powerful is seamless syncing. They can sync the contact and calendar information on your Mac with your iPhone or other mobile phone, PDA, or iPod touch, so it goes with you everywhere. Add an optional MobileMe account and your contacts and calendars will stay up to date wirelessly across multiple Macs, your iPhone, iPod touch, and the web, allowing you to access the information from any device with an Internet connection.

A powerful instant text messaging application, iChat is loaded with great features that make sending messages to your friends on AIM and MobileMe both fast and easy. Simple text chats feel like natural conversations, with icons and thought bubbles that make it easy to see what's saying what. You can transmit any type of file, from a web address to a photo, by simply dragging it into your chat. Pictures display right in the message window, web links open in a browser with a click. In short, iChat is the best way to IM.

Most Macs include a built-in iSight camera and microphone. When you use them with iChat, you get the easiest way to participate in high-quality video and audio chats with your friends and family. You can chat with a single person, or invite several to multiway chat. Featuring a unique 3D view, iChat practically puts everybody in the room with you. View their faces reflected into space, just as if they were sitting around a conference room table. Video backdrops can make it look like you're chatting from the Eiffel Tower, under the sea, or in front of your own custom backdrop.

Featuring an intuitive interface, iChat shows you when your buddies are available to chat. Bright icons indicate their online status, and whether they're capable of a video chat or just audio.

Mac OS X Snow Leopard (Family Pack) Overview - CNET

To start a chat, click the camera or phone icon to send an invitation. To add more people, click the icons for the meeting attendees on your buddy list and each colleague steps into your virtual office. Screen sharing allows you to observe and control another Mac's desktop, allowing you to collaborate with colleagues, browse the web with a friend, pick plane seats with your spouse, or show another Mac user how to use an application.

Both computers have control over the shared screen at all times, and you'll have audio communication while you share a screen, allowing you to banter as you collaborate. You'll be able to approve buddies that you trust, iChat blocks all attempts to send and receive IMs with anyone else. The days of rifling through stacks of CDs or flipping through channels are gone. You'll be able to browse, organize, and play your media from a central location. You can even rent selected movies for playback on your computer, iPod, or Apple TV.

It has a library of over 10 million songs, thousands of free podcasts, HD TV show and movie content, and countless audiobooks. From the application, you can choose which music, photos, contacts, and calendars will sync with your Apple mobile device. You'll be able to record and trim your own movies, and share them on the web with ease.

Completely redesigned for Snow Leopard, QuickTime X features a brand-new version of the QuickTime Player, the software used by millions to watch video on their computer screen. Thanks to the Core Animation technology found in OS X, the QuickTime Player boasts a clean, uncluttered interface with controls that fade out when not needed.

Rather than using text-only chapter names, QuickTime Player displays frame-based thumbnail images for each chapter marker, making it easy to navigate your chaptered media. The QuickTime Player allows you to trim your media to an ideal length by removing unwanted portions from the beginning or end of a clip. Rather than relying on a simple timeline, it displays frame-based thumbnails that help you make the perfect edit. After conversion, the software delivers the content to your iTunes library.

You can also use the software to publish your media to MobileMe or YouTube, without having to worry about file formats or resolution settings. You'll be able to use the QuickTime Player to capture live audio and video, directly from your built-in iSight camera, FireWire camcorder, or microphone. Just click the record button in the player to start capturing your audio or video to disk. You can also catch action on your screen thanks to the screen recording feature, perfect for creating instructional media or when you want to show a friend how to do something.

QuickTime X is optimized for the latest media formats, such as H. It also supported GPU-accelerated video decoding of H. QuickTime X takes advantage of the proven capabilities of ColorSync to color-manage your media for the best playback experience for sharing to your iPhone, iPod, or Apple TV.

You can send them to your friends, use them as iChat icons, add them to your address book, and organize and edit them in iPhoto. Photo Booth makes it easy to take photos with your Mac's built-in iSight camera. Just look into the lens, smile, and click. Before it snaps your photo, Photo Booth will flash your display with a bright white to add more light to your face. You'll be able to take a simple snapshot, use burst mode to take 4 quick pictures. You won't have to put a quarter in your computer for this Photo Booth to take your picture.

Smiling is optional close. Everything on your computer is backed up automatically, including photos, music, videos, documents, applications, and settings. You'll be able to use it to travel back in time to a previous back up to recover files that were accidentally changed or deleted. Working with your Mac and an external hard drive or Apple Time Capsule, Time Machine automatically backs up your entire system.

It protects system files, applications, user accounts, preferences, music, photos, music, and documents. Rather than keeping a spare copy of every file, Time Machine remembers how your system looked on any given day, allowing you to revisit your Mac as it appeared in the past. After the initial full-system backup of your Mac is completed, Time Machine automatically makes incremental backups on an hour-by-hour basis, copying only the files that have been changed since your last backup. It does this in the background as not to disturb your work. Time Machine saves hourly backups for the past 24 hours, daily backups for the past month, and weekly backups for everything older than a month.

It's not uncommon for someone to delete a file accidentally. In that event, simply enter the Time Machine browser and you'll see how your computer looked on the dates you're browsing. You can browse for files using Cover Flow, or even perform a Spotlight search across all of your backups. The timeline allows you to select a specific date, or you can let Time Machine fly through time to find your most recent changes.

Before recovering a file, you can use Quick Look to verify its contents. Once you've located the file you wish to bring back to life, click Restore and it will be brought back to the present. When your mobile Mac is connected to your backup drive, Time Machine works as you'd expect it to.

When it isn't connected, Time Machine also works as you'd expect. It keeps track of which files have changed since the last backup, and backs them up to your backup drive the next time you connect. On any Mac, if Time Machine is unable to perform a backup for any reason, it is duly noted in its preference pane. If you're setting up a new Mac with files from your old computer, you can use Time Machine to help simplify the process.

You can choose any date recorded in Time Machine, allowing you to set up your new Mac exactly as your previous one was on a specific date. UNIX is renowned for its robust, proven foundation that is scalable, powerful, and crash-resistant. Boasting tens of millions of users -- consumers, scientists, animators, developers, system administrators, and more -- Mac OS X is the most widely used UNIX desktop operating system in the world.

It offers a unique combination of technical elements, such as fine-grained multithreading, FreeBSD services, and zero-configuration networking. Its state-of-the-art kernel supports preemptive multitasking, symmetric multiprocessing SMP scalability, and bit virtual memory. Standards-based access control lists take UNIX permissions to the next level.

Snow Leopard features a breakthrough technology, Grand Central Dispatch, which takes full advantage of the latest multicore processors.

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GCD makes it easier for developers to create programs that utilize multicore systems to their fullest extent. OpenCL takes advantage of today's ultrapowerful graphics processors. It allows developers to harness the power of modern GPUs for any application, helping to greatly increase performance in many cases. Snow Leopard supports Xgrid, a technology that allows you to cluster a group of individual Macs together to create a supercomputer. This allows a group of Macs to solve complex scientific problems that no single computer could solve on its own. Xgrid can operate in screen-saver mode, crunching any data set when you aren't working.

You can also set up a group of computers dedicated to a task, working them around-the-clock in order to compute the solution. Bonjour technology makes it easy for computers and smart devices to work together. Bonjour-capable devices broadcast their services over a network, and listen for services that are being offered for the use of others. Your computer might find a Bonjour-capable printer that is available for printing, an iTunes playlist available for listening, an iChat buddy available for video conferencing, or another computer available for file sharing.

Even PCs running Windows can take advantage of Bonjour -- for free. Bonjour works with standard connection technologies, including Ethernet and AirPort It uses the ubiquitous IP networking protocol for connections, the same protocol upon which the Internet is built. All of the technologies driving Bonjour are open. It works with dozens of cell phone models and Palm OS-based PDAs, ensuring that data is synced between your mobile device and your Mac.

You can add or change dates on your devices and your Mac, and iSync ensures that changes are recorded properly, updating each device as necessary. Snow Leopard includes several integrated tools and technologies that allow you to automate common tasks quickly and simply. The Automator, represented by a cute robot icon, lets you build workflows that accomplish manual chores with celerity, efficiency, and ease.

You don't have to know complex scripting languages or write any code to use it. Instead, you simply create and execute automation "workflows" by dragging and dropping each step of a process, just as you would create a kitchen recipe. Automator comes with dozens of prebuilt actions that you can use to populate your workflows.

For example, say that you want to resize dozens of images for an iPhoto slideshow. By dragging individual actions into a new workflow, you can tell Automator which files to resize, how big to make them, and where to import them. Run the workflow and, within minutes, all images will be sized and placed in iPhoto, ready for use in the slideshow. It's not a problem if you want to perform an action that's not included with Automator. Simply have Automator record your actions as your perform them, and run the workflow again.

You can even save workflows to use again or to share with your friends. AppleScript, the venerable Mac scripting language, can help you take automation beyond what Automator is capable of. It is an English-like language that you can use to write script files that automate the actions of a computer and the applications that run on it. It doesn't restrict itself to repeating recorded actions; AppleScript can make decisions based on user interaction or by parsing and analyzing data, documents, or events.

For individuals, AppleScript provides shortcuts for complex tasks such as naming files, resetting preferences, or connecting to the Internet. Many users find the dozens of scripts provided with Mac OS X to be essential helpers in their day-to-day Mac experience. For professionals, AppleScript is like an extra pair of hands which perform repetitive tasks. Scripts can retrieve data and files from servers, execute scheduled updates and errands, and more. AppleScript can process hundreds of files while you focus on other issues.

For businesses, automated AppleScript workflows provide consistency, accuracy, and speed, while reducing the cost of time, materials, and staff. You can get more done in less time and with fewer mistakes.

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If you want to scale your business, automation with AppleScript makes it possible. The Services menu, available in the application menu of most applications, offers a wealth of powerful automation options. In OS X, many applications and system components publish their capabilities as "services," enabling the functions of one application to be used with the items selected in another application.

For example, using a Mail service from the Services menu, text selected in a Pages document can automatically be used to create a new outgoing message in Mail. The text of a long article displayed in Safari can be quickly summarized in a few concise sentences. In Snow Leopard, services are more simplified, streamlined, and helpful.

The Services menu is contextual, so it shows just the services appropriate for the application you're using or content you're viewing, rather than all available services. You can access services with a right click of your mouse, a Control-click of your trackpad, or a keystroke that you assign. You can configure the menu to show only the services you want, and you can even create your own services using Automator. They provide a solid foundation for the beautiful desktop, web, and media applications that the Mac is known for.

Core Image is a GPU-accelerated image-processing framework that creates many of the spectacular graphics effects in Snow Leopard and many popular applications. Using a precise, color-managed floating-point pipeline, Core Image offers over built-in filter effects such as image sharpening, color adjustments, and high-quality transitions. Developers can extend Core Image by adding their own custom filters using Image Units. Core Animation opens up the combined power of OS X graphics technologies by simultaneously compositing layers of text, graphics, and video using powerful keyframe animation techniques.

It also allows developers to enhance their applications with amazing animated user experiences and rich visualizations without having to know expert graphics and animation techniques. Core Audio is the high-resolution, low-latency foundation for audio in OS X. It integrates a range of audio functionality directly into the operating system in ways never before possible, enabling unprecedented performance and ease of use in your virtual studio. Built to handle multiple channels of high-bit-rate, floating-point digital audio, Core Audio is ready for anything - from playing back simple stereo music to powering professional audio recording and mastering solutions.

The Audio Units plug-in architecture lets developers extend the capabilities of Core Audio by adding their own audio processing routines and special effects. Harnessing the performance of the graphics processor in your Mac, Quartz Extreme delivers responsive, accelerated window compositing with full support for transparency. Every time a window moves, scrolls, or resizes, Quartz Extreme efficiently directs the GPU to update the display. OpenGL is the industrial-strength foundation for high-performance graphics in OS X, and the gateway technology for accessing the power of your system's GPU.

It includes a brand-new player application, offers optimized support for modern codecs, and delivers more efficient media playback, making it ideal for any application that needs to play media content. This enables practically any Mac application to display, create, and print PDF files. The built-in Preview application offers a full-features PDF viewing experience, complete with searching and annotation capabilities. The printing system takes full advantage of the PDF's resolution independence to deliver excellent printing quality on popular inkjet and PostScript printers.

Snow Leopard features built-in support for many RAW images from popular high-end digital cameras. It supports more than formats from major manufacturers, including Canon, Nikon, and Pentax. Security Snow Leopard features a multilayered system of defenses against viruses, other malicious applications, and malware. It prevents hackers from harming your programs through a technique called "sandboxing" which restricts which actions programs can perform on your Mac, what files they can access, and what other programs they can launch.

Other automatic security features include Library Randomization, which prevents malicious commands from finding their targets, and Execute Disable, which protects your computer's memory from attacks. The bit applications found in OS X are even more secure from hackers and malware than older bit software. This is because bit applications can use more advanced security techniques to fend off malicious code. Files downloaded from the Internet, no matter how innocuous they may appear, may contain dangerous malware in disguise. Files you download using Safari, Mail, and iChat are screened to determine if they contain applications.

If they do, OS X alerts you, warning you the first time it is opened. You can decide whether to open the application or to cancel the attempt. Snow Leopard uses digital signatures to verify that an application hasn't been changed since it was created. Mac OS X makes it easy to customize and utilize security features. Setting up secure file sharing only involves a quick trip to System Preferences.

FileVault lets you encrypt all the files in your home folder with just a few clicks, using a password of your choosing. The firewall comes preconfigured to block online intruders, but it's easy to make whatever changes you want. Integrated parental controls can manage, monitor, and control the time that your kids spend on the Mac. They can also limit web sites that can be visited and with whom they can chat. Phishing is a form of fraud in which online thieves try to acquire sensitive information, including user names, passwords, and credit card details, by creating fake websites that look like legitimate companies.

Safari's antiphishing technology detects these fraudulent websites, protecting you from these scams. If you visit a suspicious site, Safari disables the page and displays an alert warning you about its suspect nature. Snow Leopard makes it easy to stay safe online, whether you're checking your bank account, sending confidential e-mail, or sharing files with friends and coworkers.