Hi Mark,
If you want to test TSS not coming up at IPL time, you can remove the TSS CAKOLINK library from linklist and the TSS CAKOLPA library from the LPA list before IPLing. Once TSO is up without TSS ever having come up, the logon information from SYS1.UADS, including the password, will be used.
I found the following IBM link
IBM Knowledge Center
which states the following:
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Moving the TSO user information to the RACF database eliminates the need to maintain an entry in SYS1.UADS for each TSO user. However, you must maintain entries in SYS1.UADS for certain users (such as IBMUSER and system programmers).
**
We recommend you maintain entries in SYS1.UADS for those same users (such as IBMUSER and system programmers).
Best regards,
Bob