Want finer control over notifications? System Preferences gives you a ton of options, including re-ordering apps in Notification Center, choosing the number of items that appear at once and the alert style.

You can now toggle all alerts and banners off just by swiping up with two fingers within the Notification Center. Alerts (for things like appointments) will stay on the screen until you either close it or hit Show to open the related app.Д¬lick to EnlargeIf you really need to focus on your work and don't want any distractions, you'll be glad to know that Apple has added a nice feature since the Developer Preview.

If you click on a banner, it will open the corresponding app. Just swipe with two fingers to whisk banners off the screen. Banners (for things like incoming email and messages) disappear after five seconds, but you don't even have to wait that long. You can even post Twitter and (soon) Facebook updates right from this area using Share Sheets.Д¬lick to EnlargeMountain Lion delivers two types of notifications: banners and alerts. Just swipe with two fingers from the right side of the trackpad to see incoming emails, upcoming appointments, Twitter notifications, and more. That's why Notification Center will be a breath of fresh air. Just because Macs have bigger screens than iPads that doesn't mean alerts can't get annoying.

Os x mountain lion 10.8