please let us know what you want to do with this thing...
for a laptop, all you need to do is hook it to the stereo and turn it on... doenst get much easier than that.
lots of people are asking for complete instructions.. but your not going to get a step-by-step procedure on how to do it.
for a real car computer... do you know how to build a computer? do you know how to hook up a car stereo? put the two together.