Introducing a new Steam feature that lets you play your couch co-op games with friends over the internet, together.
Now in Beta! With Remote Play Together, you can now invite Steam Friends to join your local co-op, local multiplayer, and shared/split screen games online. Up to four players,or even more in ideal conditions, can instantly join in the fun. Only the host needs to own and install the game, while additional players connect through Steam Remote Play streaming technology.