Calling a Help System Directly
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For additional Help system functionality not provided by the VCL, Vcl.Forms.TApplication provides a read-only Vcl.Forms.TApplication.HelpSystem property that allows direct access to the Help system. The HelpSystem property is an instance of an implementation of the interface System.HelpIntfs.IHelpSystem. IHelpSystem and System.HelpIntfs.IHelpManager are implemented by the same object, but the IHelpSystem interface allows the application to talk to the Help Manager, and IHelpManager allows to the Help viewers to talk to the Help Manager.