If you have a broadband modem or one that is supplied from your internet service provider (ISP) you can most probably  connect two computers  to it without needing a router. If you look at the picture of my modem below, it has a USB (blue) and a ETHERNET (yellow) port. Of course there are many other ways to  connect two computers  together to share files or an internet connection, however this article is about connecting two computers to one modem. My service provider, Telstra Australia, supplied this modem to me. It came with an installation disc, which you should use to connect to the modem through the USB. Now if you do not have a router, but have a similar modem to the one shown, you can connect two computers off the one broadband modem and thus both accessing the internet. One computer can connect through the USB port and the other through the Ethernet. A USB cable and and  Ethernet  cable come with the modem, however to connect the second computer you...