def system(self):
        """
        Returns a `list` of all the `System` objects to the cluster.  Updates every time - no caching.
        :return: a `list` of all the `System` objects known to the cluster.
        :rtype: list
        """
        self.connection._check_login()
        response = self.connection._do_get("{}/{}".format(self.connection._api_url, "types/System/instances")).json()
        all_system_objects = []
        for system_object in response:
            all_system_objects.append(SIO_System.from_dict(system_object))
        return all_system_objects