Providing solutions to dozens of technical dilemmas, this guide features 101 tips for evaluating and circumventing RPG IV's shortcomings to help end users create extensions and program features that are not available through standard RPG IV—the primary programming language used for business application development on IBM's midrange computer systems. Using nearly 20 years of AS/400, iSeries, and System i experience, the author's insights into RPG IV extensions and System i MI instructions allow even the most inexperienced programmer to implement wrappers using code directly from the book.