... WCF, 88Interface Definition Class. See IDCinterfaces, implementing in Web servicecode-behind file, 32Internet B2B, common securityscenario, 114Internet Engineering Task Force. SeeIETFinteroperabilityadvantages ... 63creating business assembly, 66–68creating definition assembly, 64–66creating Web service, 68–69creating Web service client, 70–75designing and building service agent,75–76business assembly, ... 137–145implementing with Kerberos, 146–158business assemblycalling service agent, 80–81creating, 61, 66–68importing into Web service, 62business layer, encapsulates serviceinterfaces, 7business...