SYNCH creates a PRB, not an IRB.

________________________________________
From: IBM Mainframe Discussion List <[email protected]> on behalf of Ed 
Jaffe <[email protected]>
Sent: Thursday, October 12, 2023 12:03 PM
To: [email protected]
Subject: Re: Why it's important to take Seymour's advice

On 9/17/2023 1:39 PM, Seymour J Metz wrote:
> You use an IRB for any of
>
>      Obsolete access methods
>      STIMER with exit
>      STAI
>      STAX

An IRB is the vehicle used whenever system code wishes to call an exit
in application code -- usually via the SYNCH macro.

For example, all VTAM exits (ATTN, LOSTERM, etc) run in an IRB.


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Edward E. Jaffe
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