Steam’s Remote Play Together feature, which allows you to stream local multiplayer games with friends over the Internet, will no longer require every player to have a Steam account.
The new feature, currently in beta, allows Steam users to invite a friend to their game with a link, after installing the Steam Link app.
The new feature has its limits. Games will need to already support the Remote Play Together feature to work and only one friend without a Steam account can join a multiplayer session. If you want to add more, they must have an account. There are advanced filtering options to find these games.
To test this feature, go to your friends list in the Steam interface and click the “Copy Link” button while playing a Remote Play compatible game. Steam says you can send links to your friends to play on Windows, Android, iOS, and even Raspberry Pi devices.
Players with their own controllers will be able to immediately join in the fun. If you have your own controller as the host, you can choose to share control of your keyboard and mouse with a remote player in the Steam Overlay.