Interest in the midrange AS/400 system has surged due to IBM's repositioning of it as a client/server machine. This guide helps AS/400 users expand their skills so that they can create more powerful commands and customize their programs. It features guidelines on how to write programs and control command usage,as well as covers hot new AS/400 RISC models. An extremely valuable appendix lists all possible AS/400 files and their layouts. Commands and sources in the book are on the accompanying diskette.