The use of the word "KEYS" in caps to indicate a mechanism that protected 
storage between the LPARs ... 

As a stated, and you rightly corrected, It was more conjecture as I have no 
insights into IBMs trade secrets.

I can only base my experience upon what we designed at Andor Systems, which was 
a CPU chip that used epi-code to manage registers, and instructs. For example, 
we had a single MOV instruction that would move up to 8 bytes of storage, the 
MVC instruction was processed by the epi-code to complete the move.

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