toggle window size

This may be a stupid question, but if I don't ask, I remain stupid. I am using Lightroom 4 (but I don't think that point is relevant), and somehow, my window has become full screen and I don't even see the 3 boxes in the upper right. How do I get back to the standard appearance? This is not true in any other program. Is this a Lightroom question? I don't think so, but.....

Windows 7 Pro SP1

Forget it. I was wrong. It IS a LR thing....Shft-Ctrl-F toggles

Sorry to bother you.

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