[Brad]

Its doable but here are the snags.

Unless both boards are set up exactly the same (permissions, default usergroups, etc etc) your going to have to double check everything upon registration, once for board one and once for board two.

Once everything checks out you will have to update both databases (asuming they reside in diff db's) with the user info.

Needless to say it is a very involded hack and how you code it depends greatly on how both boards will be set up, and how you are going to access/update the data in both db's.