I looked at SYS1.MACLIB(IHAACEE)

ACEEUSER DS    0CL9                 USERID INFORMATION
ACEEUSRL DS    AL1                  USERID LENGTH
ACEEUSRI DS    CL8                  CONTAINS THE VALID RACF USERID @02C
*                                   UNLESS (1) THE USERID ON THE   @02C
*                                   VERIFY CALL WAS '*BYPASS*' FOR @02A
*                                   AUDITABLE WORK THAT BYPASSES   @02A
*                                   AUTHORIZATION CHECKING, OR     @02A
*                                   (2) NO USERID WAS GIVEN SO THE @02A
*                                   FIELD CONTAINS AN '*'.         @02A


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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, April 30, 2020 3:46 PM, Frank Swarbrick 
<[email protected]> wrote:

> Is z/OS still limited in all cases to 8 upper case characters? I am curious 
> if a user that only has access to MQ might be able to have a longer and 
> ideally mixed case user ID. They wouldn't have access to TSO or CICS or IMS.
>
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