SWI-Prolog -- help

Documentation
- Reference manual
  - Overview
    - Online Help
      - library(help): Text based manual
        
        help/0
        
        help/1
        
        show_html_hook/1
        
        apropos/1
        
        apropos/2
        
        help_apropos/4
        
        help_text/2
        
        tty_link_hook/2
- Packages

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

[nondet]help_apropos(+Query, -Obj, -Summary, -Score)

Find matching documented objects in the help database. Obj is the formal object identifier, Summary its summary description and Score is a number indicating the quality of the match.