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To do a screen shot on a Mac you will, at the same time:

1. Hold down the apple button 2. Hold down the shift button 3. Hold down the number 4 button

Instead of having an arrow as your cursor, a selection crosshairs will appear. You then will hold down the mouse and drag the mouse until you have highlighted all the material you want in your screen shot. Once you have let go of the mouse, the screen shot that you have taken, will appear on the desktop.