Category: DOS kernel
INT 21 - 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 SeeAlso: AH=3Dh,AH=45h