code: protected User loadUserWhere (String where)
          throws PersistenceException
      {
          User user = load(_utable, where);
          if (user != null) {
              user.setDirtyMask(_utable.getFieldMask());
          }
          return user;
      }
docs: Loads up a user record that matches the specified where clause.  Returns null if no record
  matches.