Customizing the Notification Center
Several OS X Mountain Lion apps take advantage of a feature called notifications, which enables them to send messages to OS X about events and alerts that are happening on your Mac. For example, the App Store uses the Notification Center to let you know when there are OS X updates available.
There are actually four kinds of notifications:
Sound. This is a sound effect that plays when some app-related event occurs.
Alert. This is a message that pops up on your MacBook Air screen, as shown in Figure 4.18. You must then click a button to dismiss the message before you can continue working with your current app.
4.18 An example of an alert notification.
Banner. This is a message that appears in the top-right corner of the screen, as shown in Figure 4.19. Unlike an alert, a banner allows you to keep using your current app and disappears automatically after a few seconds.
4.19 An example of a banner notification.
Badge. This is a small red icon ...
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