On Fri, 11 Jun 2021, at 21:02, Paul Gilmartin wrote:

> Do LIBDEF/ALTLIB immediately ALLOCATE the data sets named?

Twenty+ years ago I always used ALLOC to allocate the datasets 
concerned, and only if that worked then issued LIBDEF/ALTLIB via 
their ddname interfaces.

-- 
Jeremy Nicoll - my opinions are my own.

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