When SC is enabled, the token negotiation and authentication happens once compared to other tokens where that negotiation is done for each request to the service.
Jason Hogg is blogging, what good news. I have been working with Jason for almost two years on different projects (Shadowfax, some applications blocks, and other projects for web services).
Jason is program manager on the Patterns & Practices team, a smart guy and guru on web services.
He has been writing excellent articles about WSE, SAML and his work on Microsoft. Check out his blog at http://blogs.msdn.com/thehoggblog/
Last week, Sergio, a friend of mine asked me the following question about WCF "Hey Pablo, do you know how WCF does to create a channel with a specific interface on the fly ?".
Federation is key concept that allows to enable collaboration across multiple security or trust realms.
There are many resources on Internet about this topic so I won't enter in details during this post.
The solution that I will give is based on the second extension of this pattern: