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INT 2F - Multiplex - DOS 3+ internal - PERFORM CRITICAL ERROR INTERRUPT
        AX = 120Ah
        DS = SS = DOS CS
        STACK: WORD extended error code
Return: AL = user response (0=ignore, 1=retry, 2=abort, 3=fail)
        CF clear if retry, set otherwise
        STACK unchanged
Note:   can only be called during a DOS function call, as it uses various
          fields in the SDA to set up the registers for the INT 24
SeeAlso: INT 24