supervisorctl add & remove commands

Context ======= In the supervisor documentation , I can read the following parameters, for the supervisorctl add and supervisorctl remove control commands: > add \ […] > > Activates any updates in config for process/group >remove \ […] > > Removes process/group from active config Problem ======= I am not sure to get what it means concretely for the processes running on the system to "activate" an update in config, neither to "remove" a process/group from "active config". Question ======== What do these two commands exactly do? - when no supervisord config file has been modified beforehand? - when config files have been modified prior to using these? (both when supervisorctl reread has been used and not) Bonus (optional) question ------------------------- - Does supervisorctl update internally uses remove and add? If so, how?