APPC/MVS Program Environment

Any MVS program that invokes APPC/MVS services, or is attached by an APPC/MVS LU in response to an inbound request, must be running in the following environment when it invokes APPC/MVS services:

Authorization:

Supervisor state or problem state, any PSW key

Dispatchable unit mode:

Task or SRB mode

Cross memory mode:

Any PASN, any HASN, any SASN

AMODE:

31-bit

ASC mode:

Primary or access register (AR)

Interrupt Status:

Enabled for I/O and external interrupts

Locks:

No locks held

Control parameters:

All parameters must be addressable by the caller and in the primary address space, except for the buffer parameter of ATBSEND, ATBRCVI, ATBRCVW, and ATBEXAI, which may reside in another address space or a data space.