Term for feature that abstracts RPN program location?

[Artur - Brasil]

Weel, the only answer that occurs to me is: OPERATIONAL SYSTEM!
I don't remember a particular name of this segentation and abstraction to user. All computers work like this PROCESSOR <-> RAM (and some other parts), but who cares where anything is in machine, is the OS.
Be it in a calculator, in a computer, in my watch, it doesn't matter.
Also, one simple name that occurs to me is: Von Newmann architeture... data and instructions share the same space. Who knows what is one and what is another? SO.
But all of this you already know...