Linking Context-Sensitive HTML Help
http://www.componentone.com/d2hhelp/162.linkingcontext.sensitivehtmlhelp.asp

ComponentOne
1999

Abstract:

The mechanism that Doc-To-Help uses for mapping topics in a context-sensitive HTML Help differs from the mechanism it uses for context-sensitive WinHelp. This article tells you what you need to know to properly link context-sensitive HTML Help to an application.