INT 31 P - DPMI 1.0+ - SET REAL MODE EXTENDED PROCESSOR EXCEPTION HANDLER
        AX = 0213h
        BL = exception or fault number (00h-1Fh)
        CX:(E)DX = exception handler selector:offset
Return: CF clear if successful
        CF set on error
            AX = error code (8021h,8022h) (see AX=0000h)
Notes:  specifies address of protected-mode handler for real-mode exception
        DPMI host performs a switch to protected mode, reflects the exception
          to the virtual machine's primary client, and returns to real mode
          on the handler's completion
SeeAlso: AX=0211h,AX=0212h