FWIW, I came across this while I was getting the latest versions of some other utilities from sysinternals (my employer still makes me use Windoze):
http://www.sysinternals.com/Utilities/Portmon.html I don't know if anyone else is doing any parallel port scanner development work, so maybe no one cares. But if I can't get any better info from Mustek, possibly I can use this utility to reverse engineer the communications protocol between the Windoze driver and my Mustek 1200 III EP scanner. -- Ron ronhd at users dot sourceforge dot net Opinions expressed here are all mine.