There have probably been times when you've wanted to move a
window on your screen but you didn't feel taking your hands off the keyboard
to do it. You can actually do it with nothing but your keyboard! Here is
the key sequence that does it...
ALT + Spacebar then press M
Now use the arrow keys to position the window where you want
it. When you're happy with the position, press the ENTER key to lock
it in place. If you change your mind and want the window to go back
to where it started, just press the ESC (Escape) key.