Thanks, Tom. I wish they would put a little more informal "how it works"
(like what you wrote!) in the manuals. There's not one (relevant) word about
CSVDYLPA in the Authorized Assembler Guide (or if there is I did not manage
to find it, which from the user's point of view is the same thing).

The fear is that you miss one "gotcha" and head down a wrong path. 

They did a very nice job on CSVDYLPA from the point of view of options, and
the documentation is very thorough in terms of details. Great return codes,
it looks like. No ERRET= or anything like that to deal with.

Charles

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of Tom Marchant
Sent: Thursday, February 10, 2011 5:43 AM
To: [email protected]
Subject: Re: CSVDYLPA question

On Wed, 9 Feb 2011 16:26:44 -0800, Charles Mills wrote:

>It appears to me that the 8-character module name(s) passed to 
>CSVDYLPA must
>be unique, is that correct? That is, unlike LOAD, it is not possible for
two
>different jobs or STCs to have access to different versions of a given
>module, both of which have the same name. Am I missing anything?
>
>I am thinking specifically of a test version running in parallel with a
>production version. Both want to load their subsidiary module 'FOO', but
the
>test version has a newer FOO than the one production already has in
storage.
>Would the ADD fail? Or would the new FOO cause the old FOO to be deleted,
>leaving users who referenced it by address pointing at orphaned storage?
>
>Or would the new FOO replace the old FOO logically, but leave the old FOO
in
>memory such that users who referenced it by address would continue to use
>the old copy?

To add to Binyamin's comments, if you want to delete a module from 
LPA that you had added with CSVDYLPA, you must do it explicitly. When 
you add a module to LPA using CSVDYLPA and that name is already in 
LPA, you end up with two modules with the same name.  When a 

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