Answer / aeon533

re entrancy is concept of OS. It means a program does not
modify itself so that it can re-enter to itself and
continue processing after an interruption by OS. It helps
to buld a multitasking environment in an online system. Now
CICS is a DB/DC subsyetm of MVS and while it is NOT an OS
still it has the facility of this re-entrancy. Hence this
facilty is called Quasi-reentrancy.

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