How to tell if I'm registered with a Gateway?

Is there any good way to tell if my JID is registered with a Gateway?  I'd 
like to have my client prompt users to register with the Gateway if they are 
not already, but certainly do not want a prompt every time they log in!

Thanks.

-- 
Stephen Paul Weber, @singpolyma
See <http://singpolyma.net> for how I prefer to be contacted
edition right joseph
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