I have the very same unit in my jeep.
A temporary measure until I save enough to do my carputer properly
Hate to break this to you but you will not be able to control a computer with it, unless you find a way to hack into the t/s.
Its an "all in one unit" sort of thing.
It doesn't have any kind of connector on it for sending the t/s presses to another place.
BTW the tv tuner is poor even when hooked up to my house aerial the picture was crap.