Notification Center
A notification is an important status message. On the iPhone, you get one every time a text message comes in, an alarm goes off, a calendar appointment is imminent, or your battery is running low.
iPhone apps use this mechanism, too. Nowadays, you get a message when your friends post updates on Facebook or Twitter. When your flight is two hours from takeoff. When a new Groupon discount becomes available. When your online Scrabble or chess partner makes another move.
It’s no different on your Mac. Mail and Messages might want to let you know that a new message has arrived. Game Center might want you to realize that it’s your move. The Calendar app might want to flag you that an important meeting is about to start.

Figure 10-1. Left: In Mountain Lion, all Mac features get your attention in the same quiet, uniform way: with a bubble like this one. Right: Here’s the Notification Center, where all those incoming messages pile up, for your inspection pleasure.
In Mountain Lion, you’ll know when some app is trying to get your attention: A subtle message bubble slides into view at the top right of your screen (Figure 10-1, left). Some of these alerts slide away again after 5 seconds; others require you to click a button, like Close, Snooze, or Show (which opens the program that’s waving its little hands in your face).
Note
Only apps you got from the Mac App Store can tap into ...
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