Int 21/AH=46h

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DOS 2+ - DUP2, FORCEDUP - FORCE DUPLICATE FILE HANDLE

AH = 46h
BX = file handle
CX = file handle to become duplicate of first handle

Return:
CF clear if successful CF set on error AX = error code (04h,06h) (see #01680 at AH=59h/BX=0000h)

Notes: Closes file with handle CX if it is still open. DOS 3.30 hangs if BX=CX on entry. Moving file pointer for either handle will also move it for the other, because both will refer to the same system file table

See Also: AH=3Dh - AH=45h

Category: DOS Kernel - Int 21h - D

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