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     The effect of this function is equivalent to closing and reopening
     a file, or to duplicating a handle for the file with Int 21h
     Function 45h and then closing the duplicate. However, this
     function has the advantage that it will not fail due to lack of
     handles, and the application does not risk losing control of the
     file in multitasking or network environments.
 
     If this function is requested for a handle associated with a
     character device, a success flag is returned but there is no other
     effect.
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