I think the prefix is remembered across TSO sessions, and it is stored in the 
TSO segment of RACF. However, it is stored at LOGOFF time, so interim changes 
are not recorded.
Lennie

-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Bob 
Bridges
Sent: 04 March 2024 19:36
To: [email protected]
Subject: Re: Changes to user's TSO PROFILE

(Although come to think of it I guess PREFIX/NOPREFIX isn't one of the fields 
recorded in TSS.  I don't remember about ACF2 or RACF.)

---
Bob Bridges, [email protected], cell 336 382-7313

/* If you have a problem with me, text me.  And if you don’t have my number, 
you don’t know me well enough to have a problem with me.  -Christian Bale */

-----Original Message-----
From: [email protected] <[email protected]>
Sent: Monday, March 4, 2024 14:34

Protect, no, but since many of the fields in the TSO profile are recorded in 
the security ID, mightn't they at least track the changes when they occur?

-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of 
Lennie Bradshaw
Sent: Monday, March 4, 2024 10:22

The TSO prefix is stored in an unprotected control block (the ECT I think). As 
such, almost any program running in the TSO session can change it. I don't 
think that any of RACF, ACF2 or TSS can protect you against that.

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