Thanks for all the responces, both on and off list. So, I should forget about the DLL, and if I intend to connect the thing to a Linux computer, I'll have to develop the code myself for communicating with it over USB. Fair enough. I might even try that.
I've done some surfing since yesterday. Why do I always do that after asking stupid questions in public? It turns out that a Nicolas Sutre has already ported the thing to Linux: http://linuxk8055.free.fr/ Velleman links to his solution from their product page http://www.velleman.be/ot/en/product/view/?id=351346 which might mean something. Nicolas solution is only 250 lines of C code. It #includes a usb.h, so I guess a lot of its functionality is hidden there. It seems structured enough, so I might be able to find some inspiration there. I guess I have some reading to do before I can decide if I shall do this. Anyway, thanks once again for the responces. Not completely in dispair... /MiO -- http://mail.python.org/mailman/listinfo/python-list