Integrating Javadoc (API Reference) with JavaHelp (Online Help): Two Approaches
http://www.keycontent.org/tiki-index.php?page=Javadoc+and+JavaHelp

Sapir, Rick
KeyContent.org
2004

Abstract:

Although online help (either task-based or UI-centric) and API reference documents serve different purposes, there are times when you may want to at least create associations between the two or at most merge them into one system.