&SYSSMS

&SYSSMS indicates whether SMS (storage management subsystem) is available to your CLIST. For example,

PROC 0
WRITE &SYSSMS
EXIT

returns one of the following character strings:

UNAVAILABLE: Obsolete and should no longer occur. System logic error. Contact your IBM® service representative.
INACTIVE: SMS is available on your system but not active.
ACTIVE: SMS is available and active, so your CLIST can depend on it.