Spring RTS Engine

I've been working on constructing a new lobby, and looking at the protocol I saw the SUBSCRIBE command. What exactly does subscribing do?

Second question: Is there a way to consclusively know that I have successfully left a channel? It seems that I'll just have to trust that I did indeed successfully send the command.

http://springrts.com/dl/LobbyProtocol/P ... IBE:client

after subscribed to a channel and you go offline and someone writes sth. there and you come online again and join that channel, you'll get these messages.

ok thanks :)