I want to try and hook up a permanent pc in my car to my head unit so I can see my pc display on my head unit. I have a VM9512HD Head unit. I know how to hook up my computer to the av in. My problem lies in that I also want to use the touchscreen to control my computers mouse. There is a black cable coming from my head unit that looks like an rca jack that seems to be a touchscreen interface. My question is basically, how can I control my pc using my touchscreen head unit. I plan on using a separate small wireless keyboard for typing.