code: func MSetsysForUid(id int, keys, values []string) error {
  	if !_IS_ROOT {
  		return ErrNoRoot
  	}
  
  	_settings, err := getSettingsForUid(id)
  	if err != nil {
  		return err
  	}
  	return _MSet(_settings.global, keys, values)
  }
docs: // MSetsysForUid sets multiple values of the environment variables named by the
  // keys that affects the system as a whole. You must be Root.
  // It returns an error, if any.