INT 6B - NPC NCSI EXTENDED SERIAL I/O - GET STATUS
        AH = 10h
        AL = connection ID (Novell TELAPI.EXE)
        CX = ???
Return: CF clear if successful
            CL = ???
            CH = ???
        CF set on error
        ???
Note:   this function is also supported by TelAPI
SeeAlso: AX=0700h,AH=12h,AH=1Fh

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