SWI-Prolog -- apropos/1

Documentation
- Reference manual
  - Overview
    - Online Help
      - help/0
      - help/1
      - apropos/1
      - explain/1
      - explain/2
- Packages

Availability::- use_module(library(help)).(can be autoloaded)

apropos(+Pattern)

Display all predicates, functions and sections that have Pattern in their name or summary description. Lowercase letters in Pattern also match a corresponding uppercase letter. Example:

?- apropos(file). Display predicates, functions and sections that have `file' (or `File', etc.) in their summary description.