Pool File: N. Any File To Which Data Is {spool}ed To Await The Next Stage Of Processing.

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:spool file: n. Any file to which data is {spool}ed to await the
next stage of processing. Especially used in circumstances where
spooling the data copes with a mismatch between speeds in two
devices or pieces of software. For example, when you send mail
under UNIX, it's typically copied to a spool file to await a
transport {demon}'s attentions. This is borderline techspeak.
-- The AI Hackers Dictionary

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