I think Vern is trying to differentiate between a callback and an
exit. There's really not much point in differentiating, but I'll
offer this: Callbacks are usually done by passing a procedure
pointer. Exits are usually done by calling a program by name. In
the case of the callback the calling program has already loaded
the function into memory. An exit is loaded and executed by the
operating system at the behest of the calling program.
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