... to interact with. In addi-tion, the business facade may provide additional security, authentication, or screening onincoming service requests.CHAPTER 1 ■INTRODUCING SERVICE- ORIENTED ARCHITECTURE ... with excellent preparation for working with WCF in the future. This chaptercontains the following:• Overview of WCF architecture, including the Indigo service layer, the WCFconnector, hosting environments, ... businesscomponents that service those requests.Let’s consider each of these in turn.CHAPTER 1 ■INTRODUCING SERVICE- ORIENTED ARCHITECTURE8 701xCH01.qxd 7/17/06 12:48 PM Page 8 Service AgentBusiness...