The tutorial guides you how to turn off app notification display in Windows 8 developer preview OS. As we can see there are various applications available in Windows 8 Metro screen and these include apps which notifies you while you are working on your PC, for ex: Notifications of updates for internet explorer, facebook or gmail chat messages and alarms etc and these notifications are categorized into three cases;
Local notifications: Notifies only when the app is running.
Scheduled notification: displayed at the particular time set, for ex, alarms and reminders.
Push notifications: notifies even if the application is closed or not running.
Windows 8 also allows you to enable or disable notification sounds to notify when something is happening. Below given is the procedure on how to disable these notification or sounds in Windows 8 developer preview, the steps are pretty easy and simple.
Steps:
1. Click on start and select control panel in the metro screen menu.

2. Click on
Notifications and to the right side of the same page you can see all notification options to enable or disable.

3. By default all the options wiil be turned ON, in case if you want to turn off notifications of all apps, just move the black slider to left in ‘Show app notifications’, or else scroll down and look for the particular app you wish turn off and drag the slider to left.

That’s iall there is to it.