private void rmBus (Object busname)
	{
	    USB	bus = (USB) busses.get (busname);

	    if (trace)
		System.err.println ("rmBus " + bus);

	    for (int i = 0; i < listeners.size (); i++) {
		USBListener	listener;
		listener = (USBListener) listeners.elementAt (i);
		try { listener.busRemoved (bus); }
		catch (Exception e) {
		    e.printStackTrace ();
		}
	    }

	    busses.remove (busname);
	    bus.kill ();
	}