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You can use HelpFile property and HelpCommand method for TApplication class.
You can use WinHelp procedure also. This example shows, how to call the Windows Help.

procedure TForm1.Button1Click(Sender: TObject);
begin
  WinHelp(Form1.Handle,nil,HELP_HELPONHELP,0);
end;

Related topics

Create help files contents

For more

Win32 programmer's reference

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