Getter/Setter of configuration data. This can be used
        to update and modify the configuration file on the system
        by new applications.

def cfg_(self,cfg=None):
        """
        Getter/Setter of configuration data. This can be used
        to update and modify the configuration file on the system
        by new applications.
        """
        if cfg is None:
            cfg = self._cfg
        else:
            self._cfg = cfg
        self.overlay_load()
        return cfg