Let's say you mail your resume/CV to a big company. The post office is like a business delegate business because it abstracts away the remoteness between you and the company... ok my analogy isn't perfect because you have to write the JNDI, er, address on the envelope and the post office might give you a RemoteException, er, Return to Sender - No Address Found. A real business delegate would know the address (or ask a service locator) and will usually wrap a RemoteException in a custom business exception.
OK, so the company received your resume/CV and it goes directly to HR because HR is the session facade. The HR rep will communicate with the IT departments, CEO, and whoever else needed in deciding whether to bring you in for an interview. Your resume/CV does NOT go directly to any other business components, er, employees! Not even if those people are needed to make the hiring decision! This is great because the other employees don't need to know how to be HR people in addition to their other duties. We keep a separation of concerns and so the resource manager only needs to know: "I need a good SCWCD programmer that understands business delegates and session facades!" And HR knows right where to find one.