The System/38 is the AS/400's predecessor. CPF, the S/38's operating system, has always been considered sophisticated and difficult to use. When developers at IBM designed the AS/400, they incorporated many of the ease-of-use features of the System/36 into the AS/400.
IBM developed Operational Assistant (OA) in order to make the AS/400 even easier to operate. Because OA was implemented as part of the operating system, it is also available on the iSeries and i5 systems.
OA is comprised of a series of menus, help displays, and prompt displays that guide the system operator through some of the most obscure system commands. Anyone who is responsible for the operation of an i5 system should investigate and use OA.