For Windows, the keyboard accelerator is represented by an underlined letter on a button, menu, or other label:
keyboard accelerator http://content.screencast.com/users/TreefortJohn/folders/Jing/media/70d5002f-5832-448a-9379-256b7a8c4fd7/2009-01-12_2304.png
In recent versions of Windows, they are hidden until you press the Alt key. You can then press this letter to select a menu, button, or other input control.
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