If a server is selected in the server list, a popup notice shall show up showing all the names of the connected clients.
Implementation: If the selected server is not empty, request the name list via connection less protocol. We try three times (every second). If after the three times no answer comes from the server (since it may be an old server not supporting this feature) we may show nothing or a notice that this feature is not available. We should reuse the already existing protocol for updating the mixer panel during a connection.