Hypertext Documentation Tool provides a WYSWYG (what you see is what you get) editing
tool: The Hypertext Editor is for users who want to publish
hypertext information alongside of or within their authoring work.
The Hypertext Documentation Tool is fully integrated with
the other Visviva tools.
In addition, all graphic elements supported in other Visviva tools can be processed
in the Hypertext Documentation Tool to create active and dynamic presentations,
which is very useful in interactive product manuals and other multimedia authoring works.