local area network setup A local area network - or LAN - encompasses computers and other devices that connect to a server together at a specific location - whether an office or a commercial environment. Devices use LAN connections in the business to share resources. You'll find more than one computer able to connect to the same printer in a business environment, and this is done on the local area network. Mobile devices and computers can also be connected this way, and a LAN can work for as many users as you would like. So, if you have a business packed with one hundred staff members, they can all share the same connection.