Out of the box, there isnt a way. Many months ago I saw a topic or modifiaction on here which allowed several boards to use a the same "vb3_user" table. I cant find this now. May have been written for an older version of VB (3.0?). That would be your best choice ( I think).
Bit of an overkill, but you could use LDAP system. I wrote a modification which can link VB into LDAP, and there's another one around as well which you can pay for. Another solution would be Apache authentication. No modification for this as far as I know.
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