Thanks all. Thanks @John for the link. Duh -- I did not realize it was its own 
named control block -- I was thinking of it as "another TCB" analogous to JSTCB 
-- the same layout as a TCB DSECT, but with some special significance.

Charles

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
Of Tony Harminc
Sent: Monday, September 12, 2016 8:17 AM
To: [email protected]
Subject: Re: What is the STCB?

On 12 September 2016 at 10:16, Charles Mills <[email protected]> wrote:
> What is the STCB? For example,
>
> 312 (138) ADDRESS 4 TCBSTCB ADDRESS OF STCB

General purpose above-the-line extension of the TCB, conforming to more modern 
standards (eyecatcher, 31-bit clean pointers, etc.)

It's been around long anough that I find a number of fields routinely useful 
for debugging. And a couple even during normal operation, e.g.
STCBOTCB.

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