yeap, the "print screen" button copies the entire screen to the clipboard.
control+print scr will copy the active window to the clipboard.
from that you can paste into a new document in your image editor.
in psCS3 the sequence is
file> new> from clipboard> (this will set up the empty document) then you need to paste again.
so either: image> paste; or type contol+v.
after you have the screen shot in the image editor, you can crop, or add to it as needed.
...mischance nothing, thus idle woe.
all beer has food value...
all food does not have beer value.