From the manual and some experience with MPE I realise that when I
create a new file it goes into the "new file domain" and can be put
into the "permanent domain" with the FCLOSE statement.

But reading about FCLOSE and some of the options makes me wonder what
happens when you FOPEN an existing permanent file.  At the point of
opening, is some sort of copy made to the new file domain?  So when
the FCLOSE happens the new copy can be made back to the original file?

Or does it just work with the file in the permanent domain once it's
there?

Sorry if this is a very basic question.
--
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