An introduction to IBM mainframe systems; OS/390 and z/OS concepts and terms; How to use ISPF to work with JCL; The basics of Job Control Language; How to use JCL and JES facilities to manage program execution; How to use JCL facilities to allocate other types of DASD data sets; How to manage tape data sets; How to manage SYSOUT data sets; How to use JCL procedures; How to process jobs conditionally; How to use RESTART and other program execution facilities; How to manage generation data groups; How to use the SMS facilities for data set allocation; VSAM concepts and terms; How to use JCL for VSAM data sets; How to use Access Method Services (AMS); How to use JCL procedures to compile and test programs; How to use the OS/390 utility programs; How to use the sort/merge utility; How to use TSO, CLIST, and REXX; How to use UNIX System Services.