In MS Windows (every version I've tried) you can hit the "Print Screen" button (or is it "Shift-Print Screen") to take a snapshot of the screen. One does the whole screen, the other does just the active window. I just don't remember which does which right now. Then open up MS Paint, Photoshop, whatever and paste the captured image from the clipboard to your image and save.
In *NIX, Open the GIMP, select FILE->ACQUIRE and take your screen shot.
Hope that helps.
-Magnus
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RioCar 40103779
'67 Mustang