Dumb Questions time!

I've been trying to grok in fullness the various fields in the LDA 
(SYS1.MODGEN(IHALDA)). I've Googled everything I can think of and read all the 
docs I can find. I found 
http://www-01.ibm.com/support/docview.wss?uid=isg3T1000078, which helps some, 
but I'm having trouble with answers to the following:


1)      Definition of "extended user private storage". I think this means 
"memory above the line in the private (local) address space", i.e., the region, 
if it's a job, but it's never explicitly defined as such. I think this is the 
"Extended Region (ERGN)" on the drawing in the link above. Correct?


2)      Definition of "user private storage". Correspondingly, I think this 
means "memory below the line in the private (local) address space", i.e., in 
the region; "Region (RGN)" on the drawing.


3)      Is private memory "above the bar" tracked separately from memory above 
the line? Or is it, but in some other control block? Or can a non-system 
address space not use memory above the bar, despite having 64-bit 
addressability? That last actually seems like it might be the case, based on 
REGION=2047M being the max

Mostly I want to be able to report 31-bit memory usage below the line and 
above, without worrying about some ginormous definition making someone who's 
short on below-the-bar memory think they have a bunch left.

Thanks in advance.
--
...phsiii

Phil Smith III


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