This book begins with easy-to-understand explanations of subfile concepts then goes on to offer a bounty of practical examples, advanced techniques, and other cool stuff never before seen in subfile books. It is a comprehensive resource you will use over and over as you advance from basic subfile usage to gurulike mastery of subfile programming. For each topic, the book offers concepts, explanations, and practical examples you can use as templates for further development. These templates are fully functioning programs that include both DDS and RPG IV code from basic single-page display subfiles to powerful techniques like recursion, data queues, and embedded SQL. As an added bonus, each example is included on an accompanying CD-ROM, ready to copy to your AS/400. Mastering subfiles is often the defining moment in an RPG programmer's career. This book provides you with the concepts, styles, and advanced techniques using RPG IV and ILE that will enable you to become a subfile master in your own right. Upon completion of this book, you will be able to: Understand and use subfiles, manipulate database files using subfiles, display multiple subfiles on a screen, use a window subfile for selection lists, manage cursor placement within a subfile, use CL to send messages to a message subfile, use data queues with subfiles, sort a subfile dynamically using embedded SQL, use subprocedures with subfiles, and use recursive programming techniques to build subfiles.