JOBACB

Specifies the default ACB prefix.

XCOM: Specifies the ACB prefix XCOM.
xxxxxx: Specifies an ACB prefix other than XCOM. This prefix consists of one to six alphanumeric characters with an alphabetic or national character in the first position.

Default: XCOM

Notes:

The JOBACB parameter (that is, the ACB prefix) is used by XCOMJOB to obtain an ACB name by concatenating the prefix with a two‑digit number selected from 00,01,...,99. This name is performed in a manner similar to that in which TSO and NetView obtain ACB names for their users.
For example, when XCOM is specified at initialization time, XCOMJOB attempts to open the XCOM00 ACB name. If it succeeds, then that ACB will be used. Otherwise, the next one will be tried, XCOM01, and so on, up to 99 concurrent sessions.
To override this parameter at execution time, use PARM='ACBNAME=xxxxxxxx' rather than PARM='JOBACB=xxxxxx'.