I have uploaded the solution I have been using during MVP summit to demonstrate Windows Web Services API. This solution demonstrates that using WWSAPI, it is possible two build both clients and web services completely in native code. Both clients and web services built using WWSAPI can interoperate with WCF based clients and web services and exchange data between them. Avoiding managed-native code Interop when it comes to presenting a native code computational engine as a web service can have significant performance advantages. In this demo, the native code wrapper of the native code computational engine is 4-6 times faster than managed code wrapper because of the cost of managed-native code interop. You may download the solution from MSDN Code Gallery page and find instructions for building and running it in the post.
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