code: public String getListenScopeParameter( String paramName )
      {
          String retVal = null;
  
          if ( _listenScopes != null )
          {
              for ( int i = 0, len = _listenScopes.size(); retVal == null && i < len; ++i )
              {
                  String key = ScopedServletUtils.getScopedName( paramName, _listenScopes.get( i ) );
                  retVal = getRequest().getParameter( key );
              }
          }
  
          return retVal;
      }
docs: Get the parameter from the listen scoped requests
  @param paramName
  @return value of the parameter