The contents of the GAP  manual is also available as on-line help, see
Help--Help Index.  If  you need  information  about a section  of the
manual, just enter a question mark followed by the header of the section.
E.g.,  entering ?About Help will print the section you are reading now.
??topic will  print all  entries in GAP's index that  contain the
substring topic.
GAP 3.4.4