The Network action starts, joins, or ends a multiplayer session. It is the only action a game needs to set up networking — everything else (replication, ownership, late-join state transfer) is handled automatically once a session is running.

See the Networking reference for the bigger picture on sessions, transports, and what is and isn’t replicated.

#Mode

What the action does when it runs.

• Host: Open a session on the local machine and become slot 0 (the host). Other players can connect to this session.
• Join: Connect to an existing session as a client. Connections are generally handled by the host platform (e.g. Steam invites).
• Leave: Disconnect from the current session. If the host leaves, every client’s session ends too.
• Accept Invite: For platforms that surface invites from outside the game (Steam’s “Join Game” button on a friends list, etc.). Joins the session indicated by the invite.
• Show Platform Invite UI: Opens the host platform’s native invite picker so the user can choose friends to invite to the current session. Only meaningful when the platform supports it (e.g. Steam).

#Port

Visible only in Host mode. The UDP port the host listens on for incoming connections. Defaults to 5000. Any port above 1024 can be used.