First, you really shouldn't log in as root except in rare situations! Certainly not as your "usual" login.
Second, after some experimentation, I found that pressing Alt+Print Screen takes a screenshot of the currently active window, while pressing Ctrl+Print Screen takes a screenshot of the whole desktop. Pressing Print Screen by itself doesn't seem to do anything (though this may depend on your setup). However, once you have captured the screenshot, you then need to paste it into a graphics program. I opened up the GIMP and pressed Ctrl+V to paste the screenshots into a picture, which could then be modified and saved as usual.
Hope that helps.
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