Let me recommend that vendor word approach. We use it and it works well. You 
just want to define the structure that the word will point to in such a way 
that you do not paint yourself into an upward compatibility corner. The word is 
zero if you have not initialized it.

Access could not be easier:

         L      R1,FLCCVT-PSA(,0)  Point to CVT
         L      R1,CVTECVT-CVT(,R1)     Point to ECVT
         L      R8,ECVTCTBL-ECVT(,R1)   Point to Cust Anchor Table
         L      R7,CZ_from_CTBL(,R8)    Load our word
         LTR    R7,R7              Is it there?

I believe our own @Peter Relson is the custodian of the word assignments.

Charles


-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
Of Christopher Y. Blaicher
Sent: Tuesday, January 29, 2019 10:52 AM
To: [email protected]
Subject: Re: External dsect

If you are an ISV, then I would contact IBM and ask to get an ECVTCTBL word 
assigned to your company.  That word can be used to point to a CSA structure of 
your own making.  You can have a program that reads a parm file and sets 
appropriate values.

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