Thanks in either case I would to chain to the oldest RB to get the EXEC PGM=.   
CDE 

Sent from my iPhone

> On Dec 31, 2013, at 8:17 AM, Peter Relson <rel...@us.ibm.com> wrote:
> 
> 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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