[adman]

Anything past a 100 feet is not going to do you much good. An array
of 33 leds makes the beam very wide. The idea of looking at
the wall with ccd based camera is good since most see in the infrared.

Experiments with a glass partition shows that quite a lot of the infrared
beam glances off ( relfects ) so you don't get a whole lot through the
plexiglass center ( and posts! ).

Cross talk between remotes is the big problem.