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While an ISP router directs network traffic appropriately between all an ISP's customers, a less expensive router can be used at home to direct traffic between different home computers. If a family has five computers used by different family members in different rooms, all can share a single ISP connection if a router is employed. The basic idea is to connect the router's upstream port to the house's main Internet access, and to connect the router's other ports to each individual computer. Each computer will need an individual IP address. Usually this IP address has to be local in order to work properly.