idlwave-html-system-help-location
idlwave-html-system-help-location is a variable defined in `idlw-help.el
'.
Its value is "help/online_help/"Documentation: The directory, relative to `idlwave-system-directory', where the IDL HTML help files live, for IDL 6.2 and later. This location, if found, is used in preference to the old `idlwave-html-help-location'. You can customize this variable.