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A few keyboard shortcuts are worth memorizing. Virtually all of them involve the Windows key, which is available on any standard Windows keyboard.
Tapping the Windows key by itself takes you to the Start screen. Tap again to return to the program you were using previously. If you're working on the desktop, you can tap Start to toggle between the Start screen and the desktop.
To open the Charms menu, use the Windows key + C shortcut. That also displays the current date and time. Click anywhere except on one of the five charms to make the menu disappear.