Scope If you are trying to call HTML Help from Visual Basic I generally recommend using David Liske's Help subclassing module and tutorial available at http://mvps.org/htmlhelpcenter. It makes life a lot easier, lets you do things that you could not do otherwise (like use Training Card Help) and works with both Visual Basic 5 and Visual Basic 6. It comes with its own tutorial, so I will not attempt to explain it here. However, it always helps to understand how the original was designed to work before trying to override its functionality. Or you may have a project that does not need any more functionality than is provided by Microsoft. This document is intended to show you how to hook HTML Help to Visual Basic 6 and later without using add-ons. Earlier versions of Visual Basic will require you to make all calls directly to the HTML Help API or to use an add-on like David Liske's subclassing module.