Int 21H Function 45H
◄Summary► ◄Notes► ◄Back►
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▀ A seek, read, or write operation that moves the file pointer for one of
the two handles also moves the file pointer associated with the other.
▀ This function can be used to efficiently update the directory for a file
that has changed in length, without incurring the overhead of closing and
then reopening the file. The handle for the file is simply duplicated
with this function and the duplicate is closed, leaving the original
handle open for further read/write operations.
▀ [3.3+] See also Int 21H Function 68H (Commit File).
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