It really was a long time ago, but I think only one TSO user was swapped in at 
a time within each region.  (There were TSEVENTs then, much like SYSEVENTs 
now).  

Caveat:  I'm pretty much down to my last brain cell, so I could be 
misremembering.  I spent 50 years in this business;  the knowledge is still in 
my head but the table of contents and the index are both shot.  YMMV!  

> On Jun 29, 2017, at 16:09, Paul Gilmartin 
> <[email protected]> wrote:
> 
> What, then, was the scope of an allocation?  Of an ENQ?  What happened if
> multiple users concurrently ALLOCATEd SYSUT2?  I suppose carefully avoiding
> RET=HAVE could keep the DSN spaces separate.  And users would just need to
> deal with that and the "IKJ56246I type_name NOT ALLOCATED, FILE IN USE"
> condition.

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