Loading this file enables the graphical frontends for the online manual and profiler. This file is normally loaded from swipl.rc (swipl-win.rc on Windows); the file that makes XPCE known to Prolog.
This file uses call/1 to call the real work to avoid undefined predicate messages when using make/0 (calling list_undefined/0).
Since the introduction of the more advanced autoloader in library(prolog_autoload), using call/1 no longer suffices to stop this file from being loaded.