So, long story short, I'm trying to integrate a touchscreen keyboard into a desk that can be used for a PC. I have a zero, a b and a B+. Would it be possible to use one of those as a touchscreen keyboard that works on a PC? And if so, would it have to be dedicated, or could I say, use the same pi to manage multiple other touch screens on the desk. (Email, calculator, phone, etc) or is it possible to have all of those things on one larger display that overlays say, 60% of the desk itself? And connects to both a phone line with an already dedicated phone number, maybe a scanner, and the keyboard? Or would each of those require a different pi and display?