Using HTML to Deliver Context-Sensitive Online Help
http://www.stc.org/confproceed/1999/PDFs/stc-46.pdf

Rupel, Roberta A.
STC Proceedings
1999

Abstract:

Computerized Medical Systems needed to develop content-sensitive online help for a UNIX-based application. We found that this could be done using standard HTML, with each help topic in its own file and displayed in a web browser. With careful planning, we were able to create a map of the applications coded pages to our help files, giving us context sensitivity. We were able to add both keyword and full-text search capabilities. Site management is done using a source control system and a set of link check and HTML validators.