2.15 Packs: community add-ons
AllApplicationManualNameSummaryHelp

Availability:built-in
Sourceattach_packs
Attaches all packs in subdirectories of directories that are accessible through the file search path (see absolute_file_name/3) pack. The default for this search path is given below. See file_search_path/2 for the app_data search path. 
user:file_search_path(pack, app_data(pack)).

The predicate attach_packs/0 is called on startup of SWI-Prolog.