This section describes the various types of z/OS address spaces and their interrelationships.

The control region is the core of an IMS subsystem, running in one z/OS address space. Each control region uses many other address spaces that provide additional services to the control region, and in which the IMS application programs run.

Some IMS applications and utilities run in separate, standalone regions, called batch regions. Batch regions are separate from an IMS subsystem and its control region and have no connection with it. For more information, see IMS Batch Environment.