You can display a specific topic by calling the WinHelp function with the HELP_CONTEXT command and specifying the context identifier for the topic. Applications typically use the HELP_CONTEXT command in response to user requests for topics containing conceptual information or procedural help rather than information about a specific control or menu. In such cases, the user may continue to browse the help file looking for related information before returning to the application.
The HELP_CONTEXT command invokes a regular instance of Windows Help, enabling the user to access other topics in the help file. It typically displays the main help window, which includes a title bar, system menu, minimize and maximize buttons, main menu, optional navigation bar, sizing border, and a client area. The text of the selected topic appears in the client area, and the user can navigate through the help file by using hot links or navigation buttons in the main window. The regular instance of Windows Help can also be used to display help in one or more secondary windows instead of the main window.