Providing Context-Sensitive Help
In addition to providing a Help menu item, whenever possible your application should provide context-sensitive help. Context-sensitive help uses the WinHelp function to display a topic that is determined based on the current state of the application. When a user requests context-sensitive help, Windows sends your application a WM_HELP message. The user requests context-sensitive help by pressing F1 or by clicking the Help icon (if available) in the application's title bar and then clicking a menu, control, or window in your application for which to receive help. This results in a different form of the WM_HELP message being sent to your application. In either case, the lParam parameter of the WM_HELP message points ...
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