INT 21 - Novell NetWare - CONNECTION SERVICES - GET CONNECTION NUMBER
        AH = DCh
Return: AL = logical connection number
            00h if NetWare not loaded or this machine is a non-dedicated server
        CX = station number in ASCII (CL = first digit)
Notes:  this function is supported by NetWare 4.0+, Banyan VINES, and Alloy
          NTNX
        station number only unique for those PCs connected to same semaphore
          service