>ASM, RSM and VSM all work together to resolve these kinds of issues; 
>it's called "Teamwork". If you've validly GETMAINed the storage, you'll

>never know where the storage resided when you started the access; if
you 
>don't validly own the storage, you'll see the mainframe equivalent of 
>Microsoft's "Blue Screen of Death". It's been that way all the way back

>to OS/360, and, I suspect, most of the other operating systems that
were 
>used before then.

OS/360 was a real storage only operating system. DAT was introduced with
S/370. OS/390 could run on that hardware but not use DAT (and other
new hardware facilites). 

-- 
Peter Hunkeler
Credit Suisse

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