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button - technical definition
(1) A knob, such as on a printer or a mouse, which is pushed with the finger to activate a function.
(2) A simulated button on screen that is "pushed" by clicking it with the mouse.
On-screen Button
The button on the left is in its normal state. The one on the right has been depressed. When a button is clicked, it simulates the physical depression of a real button by offsetting the icon a few pixels and switching the shadow lines from the right and bottom to the top and left edges.
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