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⤷ Open help file in Delphi

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;
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