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"Mountain Lion" now has notifications -- a further iOS-ification of the desktop and notebook operating system. If it's an important notification, it will stay there at the top of the screen -- though a snooze button allows the temporary subduing of the alert. Other alerts, such as tweets or Facebook statuses, will slide away after a few seconds.
With all of those notifications, where will they go? The Notification Center, of course. It keeps everything in there from calendar reminders, Exchange and Outlook notes, birthdays, Facebook statuses, and tweets.
The Notification Center also includes operating system updates. Just like iOS 6, it includes Twitter and Facebook buttons enabling the user to update their status as and when they please without fiddling around with the applications directly.