When you hit the Translate button, the Java Script for this page creates a SOAP request, posts it to a simple ASP/VBScript based SOAP server (translate_endpoint.asp), which then processes the requset and creates the SOAP response. The response is then display by the page.
The effect is that a function is invoked on the server. The input value X is multipled by 2, the input value Y is multipled by 4.
The SOAP specification is here btw.
The VBScript for the server can be viewed here.
The server is very basic and performs no validation what so ever, and does not check method names etc.