"One of the most awesome things about WCF is that the concepts scale extremely well. If you understand the ABCs of WCF, then you can do anything from creating a simple Hello World to a complex sales processing service. It's all based on having an address, a binding, and a contract. All the other concepts like behaviors, validators, and service factories are simply supplemental to the core of the system. When you understand the basics, you have the general essence of all of WCF."