We have a brand new large projector system with 6 projectors. We use it almost every day and control it from the control booth. It is amazing and beautiful, but we forgot that every now and then we have someone wants to run a PowerPoint from the stage. I can plug in a laptop up there and they can control it, but the powers that be do not want to see a computer up there. So how do I have a controller on the stage and signal the computer in the booth to advance the slide. I do not want to run another cat6 and do USB over cat6. I have several audio cables, an S-Video, and a VGA that run from the stage to the booth. Any suggestions?