So I know you can plug the steam deck into a display, I know you can stream games from your rig to the deck, and I know from the IGN interview that you can play coop games on the deck with a second input.

My question is, could I use the deck as a controller for my PC? As in my PC runs the game and outputs to the display and the deck is only a controller. That would be nice.

My main question though is about local coop games (think overcooked).

Can I run overcooked on my PC, use my display and my controls for player 1 and have someone else use the deck as both a controller input to the game, and a display of the same game.

So not an online coop, but a local one, basically just another controller for the PC with its own display.