The basics of RPG IV including data types indicators constants and directives * Detail on all of the specification types * A complete discussion of expressions and how they should be used * Every built-in function * Every opcode * Options for organizing your program with source files modules and storage * A discussion on modern operation code optimization * An explanation of structured programming and how to apply it effectively in RPG * Instructions on how to code inter-module communications * Everything you need to know about procedures * An entire chapter on the alternate syntax options now available--most notably free-format