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Int 21 Fn 46 - DOS 2+ - "dup2", "forcedup" - Force Duplicate File Handle [D]
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 AH=59h)
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
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