Set a help file for the application. On Windows this should point to a CHM file, on Amiga to
an AmigaGuide file and on all other platforms to a directory which contains all HTML files
belonging to the application's manual (the main file must be called index.html, the index file
must be called findex.html) help file.
Once you have defined a help file, you can then use Application.ShowHelp and
Application.ShowHelpNode to open the help file.
This is currently unsupported on Android.