On a Macintosh the control key has two main uses.

Firstly, when using the mouse, if you hold down the control key while you click the mouse it gives you a contextual menu – a mini menu related to what you are doing at the time. Try it now – hold down the control key and click somewhere in this window. A menu will appear! This is exactly the same as a right-click with the mouse. The control key was more important in the days when Apple computers just had a one button mouse.
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