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Title: Close application by window name
Use FindWindow function, which returns handle of window, which you want to close. And after that, send WM_CLOSE message to this window.
procedure TForm1.Button1Click(Sender: TObject);
var
MyHandle: THandle;
begin
MyHandle:=FindWindow(nil, 'Delphi Help');
SendMessage(MyHandle, WM_CLOSE, 0, 0);
end;