The concept of a proxy is one of the most important aspects of modern programming. A proxy makes it possible to simplify many tasks that would be difficult and time-consuming otherwise. However, understanding proxies is often a difficult task because they are usually involved in much more complicated topics such as Enterprise JavaBeans (EJB) and remote method invocation (RMI). The developers of these technologies implement proxies for the users of these technologies, who are often not even aware that they are using a proxy.