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Apple Releases OS X Mountain Lion Developer Preview
Posted on 17-Feb-2012 09:00. | Tags Filed under: News.

Apple has released a developer preview of OS X Mountain Lion, the ninth major release of the world’s most advanced operating system, which brings popular apps and features from iPad to the Mac and accelerates the pace of OS X innovation.

Mountain Lion introduces Messages, Notes, Reminders and Game Center to the Mac, as well as Notification Center, Share Sheets, Twitter integration and AirPlay Mirroring. Mountain Lion is the first OS X release built with iCloud in mind for easy setup and integration with apps.

The developer preview of Mountain Lion also introduces Gatekeeper, a security feature that helps keep users safe from malicious software by giving them complete control over what apps are installed on a Mac. The preview release of Mountain Lion is available to Mac Developer Program members starting today. Mac users will be able to upgrade to Mountain Lion from the Mac App Store in late summer 2012.

“The Mac is on a roll, growing faster than the PC for 23 straight quarters, and with Mountain Lion things get even better,” said Philip Schiller, Apple’s senior vice president of Worldwide Marketing. “The developer preview of Mountain Lion comes just seven months after the incredibly successful release of Lion and sets a rapid pace of development for the world’s most advanced personal computer operating system.”

The new Messages app replaces iChat and allows users to send unlimited messages, high-quality photos and videos directly from a Mac to another Mac or iOS device. Messages will continue to support AIM, Jabber, Yahoo! Messenger and Google Talk. Starting today Lion users can download a beta of Messages from, and the final version will be available with Mountain Lion. Reminders and Notes help create and track to-dos across all devices. Game Center lets users personalize the Mac gaming experience, find new games and challenge friends to play live multiplayer games, whether they’re on a Mac, iPhone, iPad or iPod touch.

Mountain Lion presents notifications in a new way, and Notification Center provides easy access to alerts from Mail, Calendar, Messages, Reminders, system updates and third party apps. System-wide Share Sheets make it easy to share links, photos and videos directly from Apple and third party apps. Twitter is integrated throughout Mountain Lion so users can sign on once and tweet directly from Safari, Quick Look, Photo Booth, Preview and third party apps. Mountain Lion also introduces AirPlay Mirroring, an easy way to wirelessly send a secure 720p video stream of what's on your Mac to an HDTV using Apple TV.

Apple says more than 100 million users have iCloud accounts, and Mountain Lion makes it easier to set up iCloud and access documents across multiple devices. Mountain Lion uses the Apple ID to automatically set up Contacts, Mail, Calendar, Messages, FaceTime and Find My Mac. The new iCloud Documents pushes any changes to all devices so documents are always up to date, and a new API helps developers make document-based apps work with iCloud.

Gatekeeper is the new security feature that gives control over which apps can be downloaded and installed on a Mac. Users can choose to install apps from any source, just as on a Mac today, or use the safer default setting to install apps from the Mac App Store, along with apps from developers that have a unique Developer ID from Apple. For maximum security, Gatekeeper can be set to only allow apps from the Mac App Store to be downloaded and installed.

Hundreds of new APIs give developers access to new core technologies and enhanced features within OS X. The Game Kit APIs tap into the same services as Game Center on iOS, making it possible to create multiplayer games that work across Mac, iPhone, iPad and iPod touch. A new graphics infrastructure underpins OpenGL and OpenCL and implements GLKit, first introduced in iOS 5, to make it easier to create OpenGL apps. Using Core Animation in Cocoa apps is easier than ever, and new video APIs deliver modern 64-bit replacements for low-level QuickTime APIs. Enhanced Multi-Touch APIs give developers double-tap zoom support and access to the system-wide lookup gesture. Kernel ASLR improves security through enhanced mitigation against buffer overflow attacks.

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