An activation group is a substructure of a job and consists of system resources (for example, storage, commitment definitions, and open files) that are allocated to run one or more ILE or OPM programs. Activation groups make it possible for ILE programs running in the same job to run independently without intruding on each other (for example, commitment control and overrides). The basic idea is that all programs activated within one activation group are developed as one cooperative application.
You identify the activation group that your ILE program will run in at the time of program creation. The activation group is determined by the value specified on the ACTGRP parameter when the program object was created. (OPM programs always run in the default activation group; you cannot change their activation group specification.) Once an ILE program (object type *PGM) is activated, it remains activated until the activation group is deleted.
The remainder of this section tells you how to specify an activation group and how to delete one. For more information on activation groups, refer to ILE Concepts.