I don't mean to sound negative here or anything, But this seems nearly impossible. To create some kind of global vb user database. I am not a coder myself, but I have some general knowledge, and this vb-passport idea would be incredibly hard to put together. Good Luck though! I would be interested to see what you are able to come up with. Then you would have to get vb users to go on with the plan.
Cheers,
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Bradley Green
The Laser Forum Admin
http://www.laserforum.org