Code the IRRACX02 exit routine to be reentrant and refreshable.

Link-edit IRRACX02 exit routines with AMODE(31) or AMODE(ANY) and with RMODE(24) or RMODE(ANY).

The IRRACX02 exit receives control for cross-memory and SRB mode callers. It needs to be sensitive to the environment in which it is invoked and use only allowed services. If IRRACX02 changes ACEEIEP, the storage ACEEIEP points to must reside in the same address space as the ACEE (HOME). If IRRACX02 returns a range table, the range table must be in the primary address space, but the addresses in the range table must point to data in the HOME address space.

The exit must be aware that it can receive an ENVR object, or an ACEE created from an ENVR object, that originated on another system. If an ACEE was created from an ENVR object that originated on another system, the bit ACEEXNVR is set. If exits need to know the exact origin of the ACEE information, they can store this information in the installation data field pointed to by ACEEIEP.