HelpPC 2.10	Quick Reference Utility	Copyright 1991 David Jurgens
MSC: onexit_t onexit( onexit_t func )        - prototype in stdlib.h        - creates a list of functions to execute on normal program exit        - on exit functions are executed LIFO        - a max of 32 function can be registered        - returns pointer to "func" on success;  NULL otherwise        - this is a Microsoft/Lattice extension; ANSI uses atexit()        - see  exit()  abort()
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