Как найти список параллельных портов?

Code:

function PortExists(const PortName: string): Boolean;

var

hPort: HWND;

begin

Result := False;

hPort := CreateFile(PChar(PortName), {name}

   GENERIC_READ or GENERIC_WRITE, {access attributes}

   0, {no sharing}

   nil, {no security}

   OPEN_EXISTING, {creation action}

   FILE_ATTRIBUTE_NORMAL or

   FILE_FLAG_OVERLAPPED, {attributes}

   0); {no template}

if hPort <> INVALID_HANDLE_VALUE then

begin

   CloseHandle(hPort);

   Result := True;

end;

end;

{Parallel Ports}

for i := 1 to 9 do

begin

if PortExists('LPT' + IntToStr(i)) then

   List.Append('Ports: Printer Port (LPT' + IntTostr(i) + ')');

end;