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Or you can select the window with alt-tab, press alt-space to open the window menu, press 'm' to select 'move' and then use the arrow keys.

I use this all the time when windows go completely off screen and you can't grab them with the mouse. That can happen in all sorts of surprising ways.

And once you've moved it with an arrow key, you can then move it freely with the mouse until clicking.

on win7 you can also use the win button + arrows to snap it to edges of the screen. That is if it is sizable

It wasn't sizeable (or on Win7), but that's interesting to know.

Alt + space then hit m, then use arrow keys. Try it now on a non maximized window.