Abstract
The Network Basic Input/Output System (NETBIOS) started out as a high-level programming interface for PC-DOS applications to IBM's PC Network broadband LAN. The NETBIOS interface was originally developed by Sytek and operated over proprietary Sytek protocols. IBM reiterated the importance of NETBIOS by offering a NETBIOS emulator when the Token-Ring was announced, allowing applications originally developed for the PC Network to be run on the Token-Ring. Another NETBIOS milestone occurred when IBM announced the PC LAN Support Program in conjunction with the Personal System/2. The PC LAN Support program incorporates a NETBIOS emulator for operation in the newer PC Network broadband adapters, PC Network baseband adapters, and Token-Ring adapters, and works with the Personal System/2 family. NETBIOS is an interface and not a protocol per se. It defines a series of commands, but not how these commands are to be communicated between two stations on a LAN. This is one of the problem areas with NETBIOS. Vendors will implement NETBIOS on various protocols stacks. An aspect of NETBIOS is how it relates to the Open Systems Interconnection (OSI) reference model. Therefore, NETBIOS is essentially a layer 5 or session level interface, with some support for lower-level datagram services.
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