/**
  * Call system.listMethods()
  *
  * @param  array  $method
  * @return array  array(method, method, method...)
  */
 public function listMethods()
 {
     return $this->_system->listMethods();
 }
 public function __call($method, $args)
 {
     if ($method == 'methodSignature') {
         return 'signatures not supported';
     }
     return parent::__call($method, $args);
 }