In the situation that I used it in, I needed to put a printer on an IBM NetVista which does not have any com ports or parrallel ports, only usb ports. Does that answer your question?
Check out my rig:
<A HREF="http://www.anandtech.com/mysystemrig.html?id=3737" target="_new">http://www.anandtech.com/mysystemrig.html?id=3737</A>