I was wrong about the control software and relative moves. It has relative
moves relative to a fixed position, but also has moves relative to current
position. I wrote a little program that moves one direction for input 1,
the other direction for input 2. This could be modified for
left/right/up/down based on a camera for tracking. I've also seen some
programming help files on using the X-Box Kinnect camera sensor. Oh the
politically incorrect possibilities!

RogerN