What else you need
Two computers can be connected with one crossover Ethernet cable. If you have a number of machines in your office, you will need something called a switch or Ethernet hub that can connect all of your machines, including your printers. The switch/hub will have a number of Ethernet ports; you connect each Mac and printer to that box with straight (not crossover) Ethernet cables.
If you have several computers in your office, a broadband connection, and all your Macs can get on the Internet at the same time, you're probably using a router—you're already set up for networking.
If the router doesn't have enough ports for the Macs and printers in your office, you can buy a small hub or switch and connect the router to the hub or ...
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