INT 2A - NETWORK (Microsoft,LANtastic) - GET NETWORK RESOURCE AVAILABILITY
        AX = 0500h
Return: AX reserved
        BX = number of network names available
        CX = number of network control blocks available
        DX = number of network sessions available
Note:   also supported by Lantastic, NetWare, 10NET, etc.
SeeAlso: AH=01h,AH=04h,INT 5C"NetBIOS"

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