Before you distribute an HTML Help project that uses an online glossary, you need to enable glossary functionality in your project. This involves the following:
Changing properties in the HTML Help viewer so the Glossary tab is added to the navigation pane. (For details, see Adding tabs.)
Including a file called HHActiveX.DLL with your .CHM file. This is the ActiveX control that supports online glossaries with Microsoft HTML Help. (This file needs to be copied and registered on all end user systems that run Microsoft Windows. For details, see Installing HHActiveX.DLL.)
Tip: After you compile the Microsoft HTML Help project, you can test the glossary in the HTML Help viewer. The Glossary tab is displayed in the navigation pane on the left side of the viewer. When you select a term, its corresponding definition is displayed at in the Definition for box at the bottom of the pane.