Thanks Ed, that helps. So a typical "old style" PTF for DFSORT, which added 
several new functions to the product would have been an SPE, either by name or 
by fact. 

And, even with the OS on a two-year release cycle, new functions (for anything) 
can be provided (delivered) at any point (continuously) without having to wait 
for X months for the new release. That's good.

It'll keep many contributors here busy, even if IBM doesn't manage the "update 
every 11.6 seconds" of Amazon :-) 

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