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Rich Presence

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Steam's Rich Presence is what populates all the details about a user in the Friends list and importantly for multiplayer games, it's what enables the "Join Game" button on the Steam friends list.

Join Game Button

The Join Game button located on the Steam friends list in the Steam client lets a user simply click a button and it will launch the game if it's not already running and provide the game with connection details so it may join that player to their friends game.
What happens when a user presses that button is
  1. 1.
    If the game is not already running
    1. 1.
      Launch the game
    2. 2.
      Provide the connect string as a command line parameter
  2. 2.
    If the game is already running
    1. 1.
      Invoke the Game Rich Presence Join Requested event You can find this event on API.Overlay.Client or by using the Overlay Manager


To enable the Join Game button on the Steam Friends list simply set the "connect" field of the user's rich presence.
ISteamFriends Interface (Steamworks Documentation)
Read more about Set Rich Presence and the connected field
UserData.SetRichPresence("connect", connectionData);
This will set the local user's connect information to whatever string you provide for connectionData. What exactly you should pass into as your connection data depends on how your game handles the connection.
This would usually be the CSteamID of the server you are playing on, or the IP and Port if it's using a traditional TCP/UDP connection or the CSteamID of the "Host" if you are playing P2P.


Simply clear the data
UserData.SetRichPresence("connect", string.Empty);