Thanks - found out that they are subsystem data sets and not 'real' data sets.  
 Now to find another rabbit trail to go down.


Lionel B. Dyck <sdg><
Website: http://www.lbdsoftware.com

"Worry more about your character than your reputation.  Character is what you 
are, reputation merely what others think you are." - John Wooden

-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of 
William Richardson
Sent: Thursday, October 3, 2019 2:05 PM
To: [email protected]
Subject: Re: IBM SSI Function Codes 16 and 17

SSI Function code 16 and 17 are part of the set of functions that one can use 
to create a full function "I/O" subsystem; specifically providing the 'open' 
and 'close' capabilities for said I/O Subsystem (along with several others).

This type of function is usually externalized using the SUBSYS= keyword option 
on the DD statement in JCL (and associated SVC 99 TU keys).

Not sure what you expecting; but these function are NOT 'exit' points in 
open/close processing nor are they any kind of 'notification' function (like 
the console command interface SSI #10).

Have you checked out: "MVS Using the Subsystem Interface"??
(the z/OS 1.13 level of the manual is: SA22-7642-12)

Bill.....
IBM z/OS System Software Development and Service

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