Inputs? PlayerIndex, XB1 Smartglass / PS4 PlayStation App, Multiple Keyboards/Mice?

public enum PlayerIndex
{ One = 0, Two = 1, Three = 2, Four = 3, }

I think XB1/PS4 can use up to eight? And Steam allows like, 16?

What’s the deal with using a cell as a controller / secondary screen?

Is it possible to use more than one keyboard/mouse(Unlikely)?

this solves some of your problems