Relay servers have no formal idea of player groups, often called sessions. Instead, Relay uses sessions.

All players within a session are bound to the same Relay server but have no direct connection to each other. Relay doesn’t make any assumptions about the length of a player’s bindings and connections to the session. It’s up to the game client to decide whether players unbind from the Relay server at the end of a session or use the same binding for multiple sessions.