Let's review our discussion of how functions are installed into the system. We begin with elements, such as modules, macros, and source code. These elements are then processed by utilities, such as an assembler or link-editor, to create load modules. The load modules contain the machine-readable, executable code.

Your production system in a z/OS® environment consists of the z/OS operating system and all the code needed to do your everyday work. That's fine, but where is all that stuff kept, and how is it organized? Let's find out.