The File Transfer Protocol (FTP) was first defined in 1980 and revised in 1985. Since then, there have been no modifications to the structure nor the number of FTP messages types. However, we continue to see a number of new, often graphical, FTP clients and Web browsers that are able to communicate with established FTP servers running the 1985 FTP protocol. These new FTP clients appear to provide a greatly increased set of features. With reference to two distinct examples, explain how this is possible.