The :background-start command starts the background processor. The background command will not run unless the background processor has been started with this command. This command is automatically run by the coldstart procedure.
The :background-stop command stops the background processor. The background scheduler will no longer be able to run. Jobs can still be queued for execution when the scheduler is not running, but they will not start. This command has no effect on backgrounds that are already running. To stop those jobs, they must be logged off.
The backgrounds-disable-missed command disables running any scheduled background processor jobs that were missed due to the background processor being stopped (either manually or because of a service disruption).