procedure TForm1.Button1Click(Sender: TObject);
var
s: array [0..64] of char;
begin
WriteProfileString('PrinterPorts', 'DriverName', 'DRVFILE,FILE:,15,45');
WriteProfileString('Devices', 'DriverName', 'DRVFILE,FILE:');
StrCopy(S, 'PrinterPorts');
SendMessage(HWND_BROADCAST, WM_WININICHANGE, 0, LongInt(@S));
StrCopy(S, 'Devices');
SendMessage(HWND_BROADCAST, WM_WININICHANGE, 0, LongInt(@S));
end;
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