[Dx4win] How with CW for Notebook without LPT?

["Milan Gütter, OK7GU"]

Hi all,

My Asus NB with Windows 7 has no LPT port, no COM port, only USB.
Iam using USB to serial convertors for drive my radios (Yaesu, Kenwood), 
rotator and for CW keying.

I need Radio 1/2 signal for CW keying.
DX4WIN 8.04 generates this signal only via LPT ports.
I have no LPT port in my NB.

How can I get Radio 1/2 signal for CW keying?

73,

Milan, OK7GU