Drupal has a distributed authentication system
(
http://drupal.org/node/312)...
If we did do something like this, we would probably use
a standard like LDAP or ACAP rather than a home-grown one.
--
Lee Daniel Crocker <lee at piclab.com> <http://www.piclab.com/lee/>
<http://creativecommons.org/licenses/publicdomain/