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Questions about OPEN

	I have some questions about what the function OPEN returns if

	1) if the file exists, does OPEN return a closed stream?
	2) if the file does not exist and :IF-DOES-NOT-EXIST is
	   :CREATE, what does OPEN do?  create an empty and return a
	   closed stream?

	I realize that the second case is somewhat pathological, but
I want to implement something reasonable for OPEN.  The manual
(published edition) is not very clear about just what OPEN does with
a :DIRECTION of :PROBE.  It just says that OPEN does not really open
the file, just tests for its existence.

				Robert Heller