Machine or O/S (z/os) instruction to recognize a zpdt ?

"Mike Stramba [email protected] [hercules-390]" <[email protected]> Fri, 10 May 2019 12:41:34 -0400

Newsgroups	gmane.comp.emulators.hercules390.general
Message-ID	<CAA5vqSa0t464r=g00Fcv8cu3F_5VFXtL=BDYqZDEtxeGBQOWtw@mail.gmail.com>

Is there a machine or z/os instruction / command to recognize "real
iron" rather than a zpdt or "other" emulation system:)  ?

I realize that emulating the real hardware is the point, and that
maybe ???  there is no way the o/s can know  "for sure" ?

... Or maybe not ? ;)

Mike