If you are trying to determine that two files are pointing to the same
thing, you could set a lock on one and try to set it on the other.  If it
will not let you do it, then you have the same file.

( note that my first thought was to write an item, but that could cause
problems if anyone else was using the file. )

give the lock a unique name like testingFilePointerTestProgram so you don't
have issues with existing data.
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