INT 7A - Novell NetWare - SPX Driver - GET SPX CONNECTION STATUS
        BX = 0015h
        DX = connection ID
        ES:SI -> status buffer (see below)
Return: AL = return code
            00h connection still valid
                ES:SI -> status buffer filled
            EEh no such connection
Note:   this function is supported by Advanced NetWare 2.1+
SeeAlso: BX=0010h,BX=0011h

Format of status buffer:
Offset  Size    Description
 00h    BYTE    connection state
                01h waiting to establish connection
                02h starting (attempting to create connection)
                03h connection established
                04h terminating
 01h    BYTE    watchdog flag
                bit 0: used internally by SPX
                bit 1: SPX watchdog is monitoring connection
                bits 2-7: used internally by SPX
 02h    WORD    source connection ID (big-endian)
 04h    WORD    destination connection ID (big-endian)
 06h    WORD    sequence number of next packet sent (big-endian)
 08h    WORD    acknowledge number, expected sequence number of next received
                packet (big-endian)
 0Ah    WORD    maximum sequence number remote SPX may send without ACK from
                local SPX (big-endian)
 0Ch    WORD    remote acknowledge number, next sequence number remote SPX
                expects to receive (big-endian)
 0Eh    WORD    remote allocation number, maximum sequence number local SPX
                may send (big-endian)
 10h    WORD    connection socket (big-endian)
 12h  6 BYTEs   immediate node address--bridge on local network to destination
 18h 10 BYTEs   destination internetwork address (see INT 7A/BX=000Bh)
 22h    WORD    retransmit count (big-endian)
 24h    WORD    estimated roundtrip delay (big-endian)
 26h    WORD    retransmitted packets (big-endian)
 28h    WORD    suppressed packets (big-endian)