SWI-Prolog -- library(help)

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library(help)

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F.2.21 library(help)

apropos/1	Print objects from the manual whose name or summary match with Query.
help/0	Show help for What.
help/1	Show help for What.
help_text/2	When =Predicate= is a term of the form =Name/Arity= for which documentation exists, =HelpText= is the documentation in textual format (parsed from the HTML help).
show_html_hook/1	Hook called to display the extracted HTML document.