Go to the left bottom corner and you will meet to
the Start Screen.
Right Bottom or Up you will find the charms.
(*Share, Start Screen Button, and Devices and Settings and Search)
Top Left you will see Recently Opened Apps.

Tablet Compatible:
The only Tablet Compatible now is Microsoft Windows Surface.

*Windows Surface-Windows Surface will BE COMING OUT AT October 26.

To Download Windows Release Preview:
Windows 8 Release Preview