trojan question

Hi list users, who synchronizes with whom? the trojan client with the trojan server or the server with the client? I'd say since it must be analogue to all tcp connections the client syncs with the server, but I'm not sure whether it really works like this in the special (?) trojan case. I do not have enough background information to be sure. I already checked O'Reilly's Building internet firewalls but I cannot find there anthing covering this topic. thanx in advance Philipp