it requires alot of hacking of the code... we got it working with tampaforums and tamparacing , they share the same userbase, but separate vb installs, separate forums etc etc.
its not something we'd release as a hack... but it involves 1 database and a set of "shared" tables for the users, with separate tables for each site for the rest of them. Was quite fiddly to get working to make sure the sessions etc etc worked right..
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