Requirements Authorization: Any PSW key in supervisor state Dispatchable unit mode: Task of z/OS UNIX user Cross memory mode: PASN = HASN AMODE: 31 RMODE: Any ASC mode: Primary or AR mode Recovery mode: ESTAE. Caller cannot have an FRR active. Serialization: Enabled for interrupts Locks: No locks held Control parameters: The parameter list and the work area must be in the primary address space. ALETs must be passed for all parameters except the work area. The words containing the ALETs must be in the primary address space.