to start, this is not for my car, although depending on answers it could be an interesting idea.

anyway, how do multiple touch screens cooperate with each other?

presuming a basic 2 monitor setup with each monitor doing its own thing with a normal mouse you just seamlessly go between the two screens and operate what you will on each, but how would a touch screen operate with each it's own input to the computer, i have no idea how it may work and i only have 1 touch screen so i can't exactly test it myself.