I just figured out that when you press COMMAND + SHIFT + 4 + SPACE (with space as the last key you hit), you can make a screenshot of any window that is open, or just your dock, etc.
Very neat trick
Other print screen commando's
Makes a print screen: COMMAND + SHIFT + 3
Makes a print screen of the area you selected (selection after hitting the keys): COMMAND + SHIFT + 4
Adding Control (Ctrl) will also copy the image you made to your clipboard.
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