INT 31H 0b00H: Set Debug Watchpoint

                                                    Compatibility: DPMI 0.9+ 
 Expects: AX    0b00H
          BX:CX linear address of watchpoint
          DL    size of watchpoint (1, 2, or 4 bytes)
          DH    type of watchpoint: 00H = execute
                                    01H = write
                                    02H = read/write
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 Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
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    Info: Sets a debug watchpoint at the specified linear address.  When
          the specified action occurs, an INT 03H is invoked.

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