When Microsoft released Web Services Enhancements (WSE) version 1.0 to enable security, routing, and attachments in a supported product, significant support for advanced Web services support was also included. Web Services Enhancements 2.0 moves from simple support of base protocols to support that integrates core functionality with the operating system, and has the added enhancements around policy, trust, and context token capabilities.
WSE is still an extension to the .NET Framework support for creating and consuming Web services, but WSE 2.0 allows for new programming models. Past Web service support has relied on Internet Information Server (IIS) as its HTTP server host, and WSE 2.0 now has support for sending messages over TCP/IP or within a process. This gives you the ability to send messages from a server to a client, from peer-to-peer, one way, and asynchronously.
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