Thank you very much for your helpful reply. Obviously it is in there. And I can get it to work - sort of.

I can run vncviewer in listen mode on the Linux box and connect to it with one of the windows boxes and, after enabling desktop sharing in Knoppix, I can connect to it with vncviewer from one of the windows boxes. I can't, however, connect to either of the windows boxes from the Linux box with vncviewer. The windows machines both log in as administrator with no password and they can deal with other just fine on the (TCP/IP) network. I suspect it's a permission problem, but I can't figure it out.

Thanks again,
JCH