The ICustomHelpViewer interface contains three types of methods: methods used to communicate system-level information (for example, information not related to a particular Help request) with the Help Manager; methods related to showing Help based upon a keyword provided by the Help Manager; and methods for displaying a table of contents. 

For information on ICustomHelpViewer methods, see

• Communicating with the Help Manager
• Displaying keyword-based Help
• Asking the Help Manager for information