In parts one and two, I described a model whereby long running processes, including physical processes, can be advertised and invoked within service architectures. A system can advertise when it is willing to offer a service, set prices for different schedules, indicate limitations in its ability to respond, and otherwise describe what it is bringing to market. A system seeking a service can efficiently compare performance characteristics and prices for acquiring / invoking these services. Client and server can negotiate when and how a service is provided. These information exchanges are at the heart of smart grid communications. In this post...