As you know, the identity meta-system vision defines architectural concepts and technical standards for dealing with digital identities in a holistic way from simple end-user focused applications up to large-scale enterprise environments. While the complete vision might sound like a long-term future-vision, only, the concepts, standards and technical implementations are real, today! They can help building a security-infrastructure in heterogeneous, service oriented environments. After a short introduction of the identity meta system vision, this session is all about discussing approaches and patterns for leveraging the federated identity concepts of this vision in projects, today! We will dig into some real-world examples from Austria and analyze the usage of identity federation with WS-Trust, WS-Policy and SAML-token profile for bridging political and technological differences in heterogeneous environments. In this session you will definitely learn how the concepts of the Identity Meta System vision help you today for building a robust, interoperable and extensible security architecture!