INT 61 - PC/TCP kernel v2.05+ - "icmp_ping" - SEND ICMP ECHO REQUEST (PING)
        AH = 30h
        BX,DX = IP address of host
        CX = length of data to send
Return: CF clear if successful (i.e. reply received)
        CF set on error
            AX = error code (see INT 61"PC/TCP")
Note:   this function is not supported by Beame&Whiteside's BWPCTCP v3.0a shim
SeeAlso: INT 61"PC/TCP",INT 61/AH=00h"PC/TCP"

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