INT 31H 0211H: Query Exception Handler Vector (Real Mode)

                                                    Compatibility: DPMI 0.9+ 
 Expects: AX    0211H
          BL    exception number (00h-ffH)
          ──────────────────────────────────────────────────────────────────
 Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
          CX:DX (or CX:EDX) selector:offset of exception handler
          ──────────────────────────────────────────────────────────────────
    Info: Obtains the address of the client's protected-mode handler for
          the specified CPU exception (used when that exception occurs
          while the processor is in real mode).

          Note that CX is a protected mode selector.  When a CPU exception
          occurs while in real mode, the host switches to protected mode
          and calls this address.

See Also: DPMI API
          INT 2fH: Multiplex Interrupt
          DOS Functions
                                    -♦-