INT 61 - PC/TCP kernel v2.05+ - "ad_domain" - GET HOST NAME FROM DNS
        AH = 27h
        DX,BX = IP address in network order
        CX = length of buffer
        DS:SI -> buffer for host name
Return: CF clear if successful
            buffer filled with ASCIZ host name
        CF set on error
            AX = error code (see INT 61"PC/TCP")
Note:   normally one would use AH=25h instead of this function
SeeAlso: INT 61"PC/TCP",INT 61/AH=00h"PC/TCP",INT 61/AH=25h,INT 61/AH=26h

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