help
(help [helpfile] [topic] [settings])
The help function displays the help window with a specified help topic.
Arguments
helpfile specifies the name of the compiled .chm help file [Windows] (optional).
topic specifies a topic name in help file (optional).
settings specifies help system settings (optional).
Return Value
The function returns nil, if help file does not exist; otherwise, the function returns the name of help file.
: (help "Line")
: (help "Example" "help_chm_file_name")