Programming Concepts Illustrates the four major steps to follow when writing a simple program. What JCL is and what it looks like. What a program is. What JOB, EXEC, DD and null statements look like. How a program differs from a procedure.
Libraries Explains how a library works in a computer system.
What members are and how they are used. How the concatenation of data sets is used. Job Processing Explains how the operating system controls job processing and supervises its own activities. Definition of spooling, priority and hold. Functions of an input queue, initiator and output queue.