code: function _pollHash(){
          if (!_listenerWindow) {
              return;
          }
          var href = _listenerWindow.location.href, hash = "", indexOf = href.indexOf("#");
          if (indexOf != -1) {
              hash = href.substring(indexOf);
          }
          if (hash && hash != _lastMsg) {
              _handleHash(hash);
          }
      }
docs: Checks location.hash for a new message and relays this to the receiver.
  @private