&SYSNAME

&SYSNAME returns the system's name your CLIST is running on, as specified in SYS1.PARMLIB member IEASYSxx on the SYSNAME statement. For example,

PROC 0
WRITE &SYSNAME
EXIT

may return ATQS as the MVS™ system name.

You may want to use the &SYSNAME control variable to identify on which system in a multi-system global resource serialization complex your CLIST is running on. For details on how the SYSNAME value is used in a multi-system complex, see the z/OS MVS Initialization and Tuning Reference.