If on every invocation of the exit routine you need to
-- ALESERV ADD using the STOKEN you can save/extract
-- ALESERV DELETE

This will be quite cycle-intensive.

You also have to be aware that you might not be able to add to the access 
list. It might conceivably already be full.

If, on the other hand, your data space is already represented by an entry 
on the PASN access list of the space such that you need only extract the 
ALET to use, then that's not bad, since name/token retrieve is quite 
quick.

Peter Relson
z/OS Core Technology Design

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