The Microsoft IPX/SPX-compatible protocol uses the NWNBLINK.VXD module to support NetBIOS over IPX and to support the NetBIOS programming interface.
Windows 95 architecture for IPX/SPX-compatible protocol
The Microsoft IPX/SPX-compatible protocol is NDIS 3.1-compliant, allowing computers running Windows 95 to communicate over a routable IPX-compatible protocol. This protocol can use Novell NetWare servers configured as routers (and other IPX routers) to transfer its packets across LANs to access resources on other computers running Windows 95.