Issuing IMS commands from an ISC session

Although available to the ISC session, IMS operator commands are primarily intended for use by appropriately authorized operators of IMS master terminals and remote terminals that are directly attached to an IMS system.

Terminal operators of other (non-IMS) subsystems do not communicate directly with IMS, but rather with the control program or user-provided applications within the other subsystem. That subsystem must determine and provide procedures for its terminal operators and application programmers to follow when communicating with IMS. If an application in a non-IMS subsystem is permitted to issue IMS commands through the ISC session, IMS dependencies are introduced into that application. An ISC half session cannot be defined as the primary or secondary master terminal.