Software run on a LAN can be divided into two categories.
Network Operating System
A network operating system (NOS) is a program that allows the logical connection of stations and devices to the network. It enables users to communicate and share resources. The most popular network operating system for LANs are Novell Netware, Windows NT, Windows 2000, and UNIX.
Application Programs
Application programs allow users to solve special problems. Application programs are not specific to LANs; they are also used by stand-alone computers.