EJB technology provides a component model for server applications. It allows you to easily separate user interfaces from business logic. The server-side business logic is packaged as Enterprise JavaBean components. Once they are written and deployed on a server, such as the AS/400 system, client programmers can use them with very little knowledge of how the beans actually work. The client programmer only has to know what methods the Enterprise JavaBeans support and how to call them. Another key advantage is that, whether you are writing a Java application, a Java applet, a Java servlet or even a Visual Basic program, it always works the same. You only need to call the methods provided by the Enterprise JavaBeans to handle the application processing.