[JDEV] Finding someone's JID

[Ashvil]

How do I find someone's JID in a distributed system. Any ideas.
A similar question would be, how do I find someone's email address.

One way would be for the clients to support a field for the user to enter
another server name of where the search would take place. I could search a
user at xyz.com (having a JUD), while I am connected to jabber.org. Can this
work right now ? What are the privacy issues involved here.

Any other ideas.

Regards,
Ashvil