Pool File N. Any File To Which Data Is Spooled To Await The Next Stage Of Processing.

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spool file n.

Any file to which data is spooled 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.

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