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A light gun is a pointing device for computers and a control device for arcade and video games, typically shaped to resemble a pistol. In aviation and shipping, it can also be a directional signal lamp.
Modern screen-based light guns work by building an optical sensor into the gun, which receives its input from the light emitted by on-screen target(s). The first device of this type, the light pen, was used on the MIT Whirlwind computer.
The light gun and its ancestor the light pen are now rarely used as pointing devices due largely to the popularity of the mouse and changes in monitor display technology—conventional light guns work only with CRT monitors.

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