A router routes the traffic between the computers, and has a port to plug your DSL or cable modem into.
A switch just allows you to set up a network, you can't plug a modem into it. (I have a DLink switch I used to use with my dialup connection)
I'm not shure where a hub fits into that, but you do need a router, unless you have a computer with two nic cards, and you plug the modem directly into that computer, then with the other nic card, plug it into the switch or directly into a second computer. You'd need something like Avirt Soho running to share the internet connection that way.
I did this with my dial-up connection, and I did see degregation of speed. My boyfriend, who was the server, whould fire up Photoshop to work in graphics, and my connection would slow down to a c r a w l.
It is much better to do the router route. You have a peer to peer network, and if one of you is running some graphic intensive program, it won't slow your partner down.
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