--- "hidden" topic #1 ---

Member Flag: hidden

If a subscriber sets this flag for herself/himself, listmanager will omit
her/his address in the output of "members" and "revmembers" commands
unless the person issuing the command is a list owner.

--- "hidden" topic #2 ---

List Flag: hidden

Omits the selected list from the output of "lists", making the list
invisible to the general public.