Yes with RPCs, the good new is that the beacons in UE4 are way better than the ones we had in UE3, in UE3 it was completely different from any other unreal network system. For the client beacons you would start calling ALobbyBeaconClient::ConnectToLobby or APartyBeaconClient::RequestReservation, the first is to connect to a lobby and the later to send a reservation for a game session. For a game session you will send reservations to ensure a spot once you travel to the game server to avoid disconnections in cases where the server is full for example. The host beacons have similar methods to it’s setup.