It is not specified by the
language whether the same external file can be associated with more than
one file object. If such sharing is supported by the implementation,
the following effects are defined:
2
Operations on one text file object do not affect the column,
line, and page numbers of any other file object.
3/1
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4
For direct and stream files, the current index is a property
of each file object; an operation on one file object does not affect
the current index of any other file object.
5
For direct and stream files, the current size of the file
is a property of the external file.