Not ISRDDN, but Mark Zelden has a REXX utility called FINDMOD that might 
accomplish it.
Mark's web: http://mzelden.com/mvsutil.html

Al Nims
Systems Admin/Programmer 3
UFIT
University of Florida
(352) 273-1298

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
Of Paul Gilmartin
Sent: Tuesday, April 05, 2016 11:46 AM
To: [email protected]
Subject: Re: How to find where a module has been dynamically loaded from?

On Tue, 5 Apr 2016 08:45:14 -0500, Elardus Engelbrecht wrote:
>
>In batch job or in a session? If in TSO, you already got the answer from Ren 
>Brenton about ISRDDN.
> 
Can ISRDDN be invoked in batch?  It's a shame if so useful a facility is 
available only from a TSO LOGON.  (I can run ISPF in batch, with restrictions.)

Either way, you need to replicate your TASKLIB, STEPLIB, JOBLIB, LINKLIST 
search order.
That chore is manageable because ISRDDN MEMBER returns all candidates; you need 
only choose the most promising one.  In the worst case, a child task can 
allocate an unknown TASKLIB before LOADing the grandchild module.  That 
requires more detective work.

-- gil

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