This INTEGER is a privilege-13-scoped variant of the config save object: if a slot value (config1(1) or config2(2)) is given the running config is written there, otherwise it's written to the currently booting file, but this action is limited to configuration accessible at privilege level 13. An admin with restricted access uses this to persist their configuration changes without being able to save changes to user accounts or AAA settings. Setting it to config1(1) saves the current running configuration into the config1 slot under privilege-13 scope.