web service is an old technology (RPC) given a new lease of life 10 years ago.
* [#1 selling point] cross platform for eg between dotnet frontend and java backend
* loosely coupled
* good for external partner integration. Must be up all the time.
* beats MOM when immediate response is required.
* web service (soap) over MOM? should be feasible. One listener thread for the entire client system — efficiency