code: public Map<String, Object> getHiddenParams()
      {
          Map<String, Object> mapParams = super.getHiddenParams();
          if (this.getTask() instanceof ServletTask)
              mapParams = ((ServletTask)this.getTask()).getRequestProperties(((ServletTask)this.getTask()).getServletRequest(), false);
          mapParams.remove(DBParams.USER_NAME);
          mapParams.remove(DBParams.USER_ID);
          return mapParams;
      }
docs: Get this screen's hidden params.
  @return This screens hidden params.
  .