I believe "Storage-protection override" is the hardware facility
it is!
and VSE as well as z/OS set the bit in CR0 to activate it (all the time without
asking for any need). So Key 9 is the storage key everyone (regardless of key)
can modify as opposed to PSW-key zero which allows to modify storage in any key.
Now my persoanl peeve: they designed the feature without talking to any of the VSE people, but only MVS. hence the choice of 9 (unused in MVS but used in VSE for F4) instead of key 14 or 15 (unused in either of the two legacy op-sys).
Martin
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