# Messages Overview General description of Messages - AddPlayerMessage This is passed to handler functions registered for the AddPlayer built-in message. - ErrorMessage This is passed to handler functions registered for the SYSTEM_ERROR built-in message. - NotReadyMessage This is passed to handler functions registered for the SYSTEM_NOT_READY built-in message. - PeerAuthorityMessage Information about a change in authority of a non-player in the same network game. This information is cached by clients and used during host-migration. - ReadyMessage This is passed to handler functions registered for the SYSTEM_READY built-in message. - ReconnectMessage This network message is used when a client reconnect to the new host of a game. - RemovePlayerMessage This is passed to handler funtions registered for the SYSTEM_REMOVE_PLAYER built-in message.