code: @Override
      public void init (ConnectionManager cmgr, SocketChannel channel, long createStamp)
          throws IOException
      {
          super.init(cmgr, channel, createStamp);
          _pcmgr = (PresentsConnectionManager)cmgr;
      }
docs: Initializes the connection with its channel. Must be called with a
  {@link PresentsConnectionManager} as <code>cmgr</code>.