def param_show(self, param, l=False):
        """
        param.show [-l] [param]
              Display a list if run-time parameters and their values.
              If the -l option is specified, the list includes a brief explanation of each parameter.
              If a param is specified, display only the value and explanation for this parameter.
        """
        cmd = 'param.show '
        if l: cmd += '-l '
        return self.fetch(cmd + param)