I recently ran successfully the spring-saml-sample working with ADFS 2.0. 

However I noticed that ADFS only ask me once my user/pass, and then I can enter as many times I want but always with the same user (even when I did a global logout).

Is seems there is a cookie or something stored locally that is sent to ADFS.

What if I want to authenticate with a different user on the same machine? How can I configure saml-extension in order to force authentication again?