prolog-menu-help

prolog-menu-help is a variable defined in `prolog.el'.
Its value is

(keymap "Prolog-help"
	(On\ predicate menu-item "On predicate" prolog-help-on-predicate :enable prolog-help-function-i)
	(Apropos menu-item "Apropos" prolog-help-apropos :enable
		 (eq prolog-system 'swi))
	(nil-9 menu-item "---")
	(Describe\ mode menu-item "Describe mode" describe-mode))

Documentation:
Help menu for the Prolog mode.