A key on a keyboard which, when pressed simultaneously with another key, gives the latter an alternative function.
- Simply press the Alt key on your keyboard and use your mouse to click on any word or name, and Answers.com will provide you with the necessary information.
- Ok, press and hold the Control Key… now, the Alt key… now, tap the Delete key.
- Should the Taskbar not be visible, with the Alt key pressed, repeatedly press the Tab key until Internet Explorer is the active window, you should then be able to close it.
Late 20th century: abbreviation of alt(ernative) key.
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