[Dx4win] Radio via USB port?

[Todd]

Hi group,

A friend of mine has a laptop, CT-17, & 756 Pro with a serial to USB cable 
converter (and DX4Windows of course).  Does anyone know how to setup the 
radio interface with a USB port, or determine what port you are on?  Is this 
even possible?  He doesn't have a serial port available on the laptop, hence 
the USB cable.  I use a serial port so I've not run into this before so I 
thought I'd poll the experience of the group.
Thanks!

Todd
WM8C's Ham Links
www.wm8c.com
All outgoing email scanned with NAV2005