Windows Identity Foundation (WIF) is an extension to the Microsoft .NET Framework that enables developers to use advanced ...

Windows Identity Foundation (WIF) is an extension to the Microsoft .NET Framework that enables developers to use advanced identity capabilities in .NET Framework applications. Based on interoperable, standard protocols, WIF and the claims-based identity model can be used to enable single sign on, personalization, federation, strong authentication, identity delegation, and other identity capabilities in ASP.NET and Windows Communication Foundation (WCF) applications. 

For more information, search for article number 974405 on the Microsoft Support site (http://support.microsoft.com).