Paul, I've made come progress on a 'son of zsyncer' product and have a pre-pre-alpha Product which I need to use as a tool ASAP. I have encountered some difficulties which I hope you can assist me in resolving. My new product re-uses some of ZSyncer, particularly the basic authentication code and some of the transport code. It seems to work fine between sites which us basic authentication only but gets confused when the sites use cookie authentication. ZSyncer authenticates and transfers over links that my "son of ZSyncer" product fails on. The transport mechanism reports a 500 status to the sender; the receiver reports a 401 error (I think) and does so as "Anonymous" rather than the user under whose guise the transfer is being performed. If you have the time and interest, I'd be happy to share the code even in it's currently hacked-up state.