On the Surface RT, you can easily take a screenshot of the entire display by holding the Windows button and Volume Up button simultaneously.
taking a screenshot in desktop mode is quite simple using the Snipping Tool,
Microsoft's own screenshot app first introduced in Vista.
But this only works on "Desktop" mode, not in "Tiles/Modern" Start page.
To take a screenshot of the Start Screen:
On the Start Screen, hit the Windows key and the Print Screen key.
This will take a screenshot of the entire screen.
Next is manual paste to Paint or some other imaging program and save to file.
For some reasons trusted "Cropper" tool does not seem to work on (at least some) Windows 8 computers.
