The HelpTag software can be invoked automatically by double-clicking a help source file in File Manager or by running the dthelptag command manually in a terminal window.
Helptag does two significant tasks:
The HelpTag parser converts your marked-up files into an internal format (Semantic Delivery Language) understood by the Help System. If you've made any markup errors, the errors are reported in a file named volume.err.
If there are no parser errors, the master help volume file (volume.sdl) is created.