What do you understand by Light Pen
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a handheld photosensitive device resembling a pen, held to the display screen of a computer terminal for passing information to the computer.
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A light pen is a light-sensitive pointing input device commonly used to select or otherwise modify text or data on a screen. ... The light pen can be a very focused flashlight-type of device or a laser pointer, allowing a user to direct viewers' attention to a specific area, like a picture or text, in the presentation
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