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Meaning of PROBE-FILE for direction output

Another timing problem with this is that any way of doing it which
involves actually doing the open might leave an entry in the
filesystem, even though only temporarily.  I would not want to have to
simulate any hairy (tops-20, vms, especially version 4) operating
system's algorithm for determining if i had access -- ergo, i would
implement it by doing the open to see if it succeeds.