06-10-2010, 01:20 PM
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Introduction
-A touch screen is an input device that allows users to operate a PC by simply touching the display screen.
-The display screen has a sensitive glass overlay placed on it and we could give the desired input by touching it.
-A touch screen is based on CRT (Cathode Ray Tube) technology, that accepts direct onscreen input.
-The ability for direct onscreen input is facilitated by an external (light pen) or an internal device (touch overlay and controller) .