<snip>
>What is the 21st-Century rationale for not allowing everyone to use IPCS?
Mostly ignorance, I would guess. 
</snip>

One "practical" consideration could be "not being willing to properly 
protect dump data sets".
If that's the case, restricting IPCS makes it harder (but far from 
impossible) for "Jane Programmer" to be able to look at data captured in a 
dump that they should not be able to see. This would be very important for 
SVC Dump data sets. Probably not important for transaction dumps (I just 
don't remember their rules). Definitely not important for sysmdumps.

Peter Relson
z/OS Core Technology Design


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