public void WGDefaultChannel(String channel, String sender, String login, String hostname) {
        User user;
        boolean changed = false;
        for(Game game : games.values()) {
            user = getUser(game, sender, login, hostname);
            if(user != null) {
                user.defaultchannel = channel;
                changed = true;
            }
        }
        if(changed) {
            sendMessageWrapper(channel, sender, MSG_DEFAULTCHANNEL + channel);
        }
        else {
            tellNotRegistered(channel, sender);
        }
    }