An easy-to-use guide, containing all the information a programmer needs on IBM mainframe software products, programmer's utilities and computer languages. Organized for fast information retrieval, this reference includes all the most commonly used codes and messages for mainframe software, as well as key words and their usages for all the languages applicable to the most popular mainframe environments - MVS, VM and VSE. For each of the programs or languages, all commands are briefly discussed with general forms of usage and lots of examples. This one-stop guide is a lexicon for all functions, commands and syntax of the most widely-used software and languages, including COBOL II, REXX, CICS, CLIST, DB2, SQL, VSAM, XEDIT, CMS, DOS/JCL, IMS/DB, IMS/DC, MVS Utilities and OS/JCL.