What is a Light Pen?

A light pen is a device that connects to your computer. It is the size of a regular writing pen and is used as a pointing device on your screen. Just like in the old days when your teacher used a stick to point at the chalkboard. However this pen uses a beam of light as the pointing element. You can find more information here: http://doit.ort.org/course/input/285.htm
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