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How TApplication Processes VCL Help
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TApplication in the VCL provides four methods that are accessible from application code:

Help methods in TApplication

Method | Description
HelpCommand | Takes a Windows Help style HELP_COMMAND and passes it off to WinHelp. Help requests forwarded through this mechanism are passed only to implementations of IspecialWinHelpViewer.
HelpContext | Invokes the Help System with a request for context-based Help.
HelpKeyword | Invokes the HelpSystem with a request for keyword-based Help.
HelpJump | Requests the display of a particular topic.

All four functions take the data passed to them and forward it through a data member of TApplication, which represents the Help system. That data member is directly accessible through the property HelpSystem.

See Also

Enabling Help in Applications

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