>Then is there a reliable method for a non APF authorized program that does >not execute continuously to determine whether a capacity on demand upgrade >was performed since the last time that same program executed?
Not that comes to mind. And, in fact, the operating system has no idea that that has happened either. It knows only that a configuration change event was identified by the machine (or for whatever other reason it chooses to refresh the data, and there are some) and the system reacts to changes that it finds within the data. The ENF signal that I presume you are alluding to (non-APF authorized programs cannot listen for an ENF signal) is about the (potential) configuration change event, not about a capacity on demand upgrade. It is up to the listener to determine if there is anything of interest that has changed. >Because some of the return codes indicate invalid data. I would say "no they do not; they indicate that the data are not available". That does not relate to the value in a particular field. Peter Relson z/OS Core Technology Design
