PlayStation Knowledge Center
The Home screen replaces the XrossMedaBar(XMB) used in previous PlayStation devices.
All of your games and applications are represented as icons that can be organized and arranged to suit your taste. Tap on its icon to launch a specific game or application.
Each page of the Home screen may contain up to 10 icons, and the PS Vita can have up to 10 pages of icons. This means that upto 100 applications can be accessed from the PS Vita.
If a PS Vita card is inserted or an application is downloaded from PlayStation®Store, an application icon is automatically created (installed) and displayed on the home screen.
For more information regarding the Home screen, check out the User's Manual page.