HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens

                      INT 21,45 - Duplicate File Handle

       AH = 45h
       BX = file handle

       on return:
       AX = new file handle if CF not set
          = error code if CF set  (see DOS ERROR CODES)

       - gets another file handle for the same file
       - both file handles move in unison
       - often used to flush file data and update a file directory
         entry without closing the initial file

Esc or Alt-X to exit int 21,45 Home/PgUp/PgDn/End ←↑↓→
Converted to HTML in 2006 by Timo Bingmann