This book isn't only for novices. Tasks of all levels are included. From the Installation and Operations sections the reader will see the detailed steps for powering up and down, controlling the system console, and managing subsystems. There is an administration section that covers system values, printing, and PTF management. The system architecture section discusses libraries and library lists, files, and objects. Programming has its own section with chapters on DDS, CL, RPG, Java, and important IBM utilities. There is also a section on the Internet that covers the newer technologies. The fourth edition has had a complete update of all the chapters and adds a particularly rich set of new chapters as well. Topics like iSeries Navigator, WebSphere Application Server, SQL, Qshell, and performance are among the new chapters which will make this edition a good buy even for those who already own previous editions.