A hand-held device produces an omnidirectional beam of infra-red light which can be aimed by the user. A plurality of detectors positioned in a rectangular array adjacent a video monitor and each detector produces an electrical signal that varies as a function of the light intensity impinging thereon....http://www.google.com/patents/US5528264?utm_source=gb-gplus-sharePatent US5528264 - Wireless remote control for electronic equipment
