Dunsel

If I'm not part of the crew and earn my keep, then I'm a dunsel. And you'll not have a dunsel aboard long […]

Source: wiktionary

[page 229] For those of you who don't recognize the term, dunsel was a term first used in Star Trek to characterize Captain Kirk in the episode "The Ultimate Computer." The plotline was about a scientist, Doctor Richard Daystrom, who installs a computer that is designed to operate the Enterprise without the need for the crew. The new M5 computer would enable mankind to explore the galaxy without putting human life in danger. Without a crew, a captain is pretty useless, and at one point Kirk was referred to as Captain Dunsel. […] Well, I'm using dunsel here to describe software or applications that don't need to be on your computer. […] [page 234] More than a few systems have been accessed via the guest account or other default accounts, so one thing we need to do is to remove all the dunsel default user accounts.

Source: wiktionary

I struggled down through the galley. / And again up to the mast. / I even checked on the dunsel, / Wrapped my girl's sails down, I wrapped 'em low and I wrapped 'em fast.

Source: wiktionary

McCoy: “Who the blazes is ‘Captain Dunsel’?” / Spock: “Dunsel, Doctor, is a term used by midshipmen at Starfleet Academy. It refers to a part which serves no useful purpose.”

Source: wiktionary