The light pen was used to draw items with the aid of a tracking cross. As the light pen was moved across the screen, the part of the tracking cross sensed changes thus allowing the direction of movement of the light pen to be ascertained. The tracking cross can be redrawn to locate it at the expected new center of the light pen's position and thus appears to follow the light pen.
"light pen." A Dictionary of Computing. . Encyclopedia.com. (February 18, 2018). http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/light-pen
"light pen." A Dictionary of Computing. . Retrieved February 18, 2018 from Encyclopedia.com: http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/light-pen
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light pen • n. 1. Comput. a hand-held, penlike photosensitive device held to the display screen of a computer terminal for passing information to the computer. 2. a hand-held, light-emitting device used for reading bar codes.
"light pen." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (February 18, 2018). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/light-pen
"light pen." The Oxford Pocket Dictionary of Current English. . Retrieved February 18, 2018 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/light-pen