Shibboleth Developers

 I have walked through a few shibboleth howtos.  I do think I have shibboleth 
setup properly.  I was hoping someone could answer a few questions about 
shibboleth.  I believe the answers will help me configure shibboleth properly.

1. Is there a developer's guide/resource available.  After shibboleth is 
setup, how can a developer leverage it in existing java based applications?
2. Can I have shibboleth and adfs in the same federation?  I have seen 
examples of shibboleth and adfs interoperate, but never in the same 
federation.
3. In the end I would like to accomplish the following: login into a 
shibboleth aware application and then try to use a adfs based application 
without having to log back in (and vice-versa).  Is this possible?  If so, is 
there a document I can walkthrough to figure this out?


Thanks,
Eliot