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Does anyone know of computer-controllable (either through a serial port or network connection) LCD or DLP projectors that allow you to set the focus via the computer connection? I've been looking through online manuals for a bunch of projectors, and they either do not support electronic focus adjustment or do not list all the remote commands.

This'll be used in a research project that involves projecting messages onto various surfaces around a room. So a computer will control a bank of mirrors to direct the image, but we also need the computer to change the projector's focus based on the distance to the surface.