Start screen in Windows 8 contains tiles that are shortcuts to apps. Many of these tiles are live , meaning that they can report data from the app. For example, on the Weather app, you can see the current temperature and forecast. On the Mail app, you can see how many unread email messages you have.
Windows 8 Start screen
The new Start screen in Windows 8 gives you a larger desktop by expanding the borders left and right. This allows you to organize your apps into groups so you can see all of them.
To navigate through the Start screen, click and drag on the scroll bar at the bottom of the screen and then move the screen left or right.
You will see the scroll bar only if your groups do not fit on the screen.
Scrolling through the Start screen