* Synchronization points are still a weak point and need some work -   it's trivial to show, one client may block the whole transfer by simply  not responding. Well. If it timeouts, it will be killed and (hopefully)   it will restart the transfer. Generally, some sort of client monitoring  is needed. * On some systems (network cards, maybe) multicasting does not work -   when broadcasting does fine. It may be useful to create different  methods of multi-destination transmission