Show the desktop:   + D
Lock your computer or switch user:   + L
Launch Windows Explorer (to manage your files):    + E
Maximize the current window to full screen:   + down arrow
Restore the current window to its non-full size state:   + up arrow
Make the window go half screen to the right:    + right arrow
Make the window go half screen to the left:    + left arrow

For a more complete list see this Microsoft support document on Windows shortcut keys.

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