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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Standard_Input and Standard_Output are associated with distinct external
files, so operations on one of these files cannot affect operations on
the other file. In particular, reading from Standard_Input does not affect
the current page, line, and column numbers for Standard_Output, nor does
writing to Standard_Output affect the current page, line, and column
numbers for Standard_Input.
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.