INT 31 P - DPMI 0.9+ - SET DEBUG WATCHPOINT
        AX = 0B00h
        BX:CX = linear address
        DL = size (1,2,4 bytes)
        DH = type (00h execute, 01h write, 02h read/write)
Return: CF clear if successful
            BX = watchpoint handle
        CF set on error
            AX = error code (DPMI 1.0+) (8016h,8021h,8025h) (see AX=0000h)
SeeAlso: AX=0601h