[Zope] SSO using Zope?

[Andrew Kennel]

I've been evaluating Zope as a possible corporate portal server for my 
company.  I'm currently working on tying it to our existing directories 
via LDAP and have been very impressed.

One feature I have not been able to find any reference re: Zope is SSO.  
(single sign-on)  one of the primary uses of this portal would be the 
ability for my user's to sign in once and have the portal then pass 
their credentials on to external pages.  Have there been any attempts at 
this using Zope?

I've scoured the web sights, and the one book (Zope Bible) that I have.  
I'd like to know that what I need is possible/practicle using Zope 
before I devote too much more effort.

Any pointers/URL links/RTFM page 243 comments would be most welcome.
--Andrew