Do you have access to an ASP.NET server? Cos creating an ASMX soap class will give you a grounding on messaging via SOAP, and you can turn on GET;POST if you want to message via plain-old-XML (POX).
Web services are here to stay, but if you are like most software developers, you worry about the plaintext SOAP (Simple Object Access Protocol) messages being exchanged over the Web. Web services ...