IBM MVS Question:
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What is full form of SPOOL?

Answers:

Answer #1
To spool means "to operate (an input/output device) by
using buffers in main and secondary storage. "

Not sure if there is any full form.

If you meant SDSF, it stands for sytem display and search
facility.

Answer #2
SIMULTANEOUS PERIPHERAL OPERATION ONLINE

Answer #3
Simultaneous/System Peripherals Operations On Line

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