Steam Remote Play Together is a feature built in to the digital distribution platform Steam. Using Remote Play Together allows players to play a local multiplayer game together online.
Only one player must own the game. To use Steam Remote Play Together a player starts their supported game, goes to their friends list, right-clicks on that friend and selects remote play together.
Players will only share the game when using Remote Play Together, never their desktop or other applications. Players can also choose to share their mouse & keyboard with the other players.