There's no obvious way for an unauthorized program to discover that
information. 

If you're a supervisor state program you can issue a TPROT with a key of
0. If the condition code is 1 then the page is protected. The
interpretation of the other condition codes is left as an exercise to
the reader. Note also that there is the usual time of check to time of
reference defect with any such check. 

Why would you want to unprotect a protected page anyway? That would seem
to be a hideously bad idea if it's not your own page, and if it -is-
your own page, you ought to already know whether it's protected or not.

CC

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