Previous posters have pretty much covered the ground. UniVerse (and, I suspect
but can't be certain about, UniData) functions are implemented as subroutines,
with the first argument position on the stack reserved for the return value
which is a DATUM. It can even be a file variable or subroutine variable!
It follows that, while a subroutine can have 255 arguments, a function is only
allowed 254. Don't go there!
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