It is not possible to monitor someone's references to your or anyone else's storage (unless you write your own operating system and use the PER architecture and you're only interested in stores, or you simulate every instruction).
If you control accesses by some service, then I would say that that is not "monitoring" (and would not prevent someone from doing it themselves if they knew enough). I'd note that this discussion belongs not on assembler-list but on ibm-main. Peter Relson z/OS Core Technology Design
