As has been posted in response to earlier threads related to the jobstep
program task, ASCBXTCB contains the address of the jobstep program task
when a job is active in an initiator or a started task's jobstep program
has been attached.
And, similarly, TCBJSTCB of *your* TCB (PSATOLD) will locate this task
unless that jobstep program task itself attached a jobstep task and you're
running under that attached task or a subtask thereof.
TCBBITCB is on in any task that is within the job step ("beneath initiator
TCB").
Peter Relson
z/OS Core Technology Design
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