Before explaining how this is done, just a brief word on the history of Web Services. Web Services are a suite of specifications that enable two (or more) different software systems to interact without knowing the details of the other’s technology. SOAP, the core specification, was released in 1998 and essentially defined a way to encapsulate data in XML. Since that time, many specifications have been developed that add advanced functionality to this simple idea. These specifications are collectively known as WS-*.
Rare is a single paragraph that crams so many errors in (e.g. web services does not dictate SOAP, WS-* does not encompass all enhancements to the SOAP stack, SOAP does not define a way to encapsulate data, etc )
On the original post on Cardspace UI & ceremony, while I love a sarcastic critique post as much as the next guy (perhaps more so), and have spent a not insignificant amount of time cursing Cardspace experience myelf, I do question whether such an analysis belongs in a series characterized as 'history'.
In contrast, the post on the DocVRM complex is both apt and illuminating.