11.   Light-emitting diodes transmit the message on an invisible infrared beam in the same way a TV remote control works.

12.   One way around the problem is to bounce wide infrared beams off the ceiling, scattering the reflections around the room.

13.   Remote controls for cars need greater range than the kinds of remotes used around the home to control televisions and VCRs, which use infrared beams.

14.   Some roller coasters have the additional protection of infrared light beams that give an alarm when there is someone or something blocking the track.

15.   The computerized device uses an infrared beam to measure blood glucose levels.

16.   The kids loved the idea of playing with a movie, but seemed to have some difficulty calibrating the electronic gun that fires infrared beams at the TV screen.

17.   The purple cable plugs into the USB ports of two laptops and lets you send data much faster than over an infrared beam.

18.   The radius of the infrared beam allows someone to score a hit by firing within several inches of a sensor.

19.   The system includes an infrared beam generator and its receptor, set on tripods on both sides of the road.

20.   The system uses an infrared beam and camera, coupled with a heads-up display projected onto the lower part of the driver-side windshield.