In OSX, just hit F11 and all the windows will scoot off the screen, kind of like the "show desktop" feature in Windows.
Hit F9 though, and you'll see the super cool "show ALL windows open" feature, and you just click on the window you want to be up front.
F10 will dimm all the windows behind the one working so you can focus a little better with screen clutter.
Hope those tips help.
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