The original API for dynamic allocation was DAIR.  

> On Jun 29, 2017, at 13:13, John McKown <[email protected]> wrote:
> 
> ​This originated back is MVT days. MVT did not really have an API for
> dynamic allocation. The data set was "fake opened" (i.e. code other than
> OPEN found the DSN & extents, and built an "open" DCB and associated DEB.)​

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