>Are you sure it is a web-service? It looks a bit like some REST-communication where you wizld call a login to get a
>token (session-id) which you would use for following calls. A lot of companies call their http-based communication "web-service" despite the fact that it is not one.

Worse - I've seen them call it web service and claim it's using proper xml to communicate the content, but their xml doesn't even have proper header. They're still making a lot of money, so it seems nobody cares about the inconsistency.