public void changeMyName(String name) {
		ArrayList<Participant> participants = participantList.getParticipants();
		Participant receiver;
		String msg;
		for(int k=0; k<participants.size(); ++k) {
			receiver = participants.get(k);
			if(receiver.isOnline()) {
				msg = JsonTools.createNewNameMessage(name);
				updtools.sendMsg(receiver.getInetAddress(), msg.getBytes());			
			}
		}		
	}