Section 4 describes how the i5 Server is organized. It covers the concept of libraries, objects, library list, and practically everything you need to know about files. There is also a section on the System/36 Environment. If you are working in a shop that still has S/36 code running (and there are a lot of you), this section will help you understand how to use, maintain, and operate the system from within the S/36 Environment.