Pogue's Basics: The master class on capturing screenshots

Maybe you’re writing up instructions, illustrating a computer book, or collecting proof of some secret screen you found buried in a game. You can take pictures of the entire screen or capture only the contents of a rectangular selection. On the Mac, it’s Command-Shift-3 to capture the whole screen, or Command-Shift 4 to grab a region of the screen.

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Pogue's Basics: The master class on capturing screenshots