Chase asks: "Has anyone ever used an old PDA as a control panel for a larger headless system? I was planning on installing a computer in my car to do a variety of things and I happen to have a few old PDAs laying around gathering dust. (HP320LX, HP360LX, PalmPilot Pro). The general idea here is that you could power the PDA from the car and use a null modem cable to create a connection between the PDA and the headless computer. I have a matrix oribital display and compatible number pad, but the PDA touch screen with buttons and back light seems like it would be much cooler."