code: public Object down(Event evt) {
          if(evt.type() == 1) // MSG
              return ch.down((Message)evt.getArg());
          return ch.down(evt);
      }
docs: Enables access to event mechanism of a channel and is normally not used by clients directly.
  
  @param evt sends an Event to a specific protocol layer and receives a response.
  @return a response from a particular protocol layer targeted by Event parameter