I have two computers at home that I want to connect to my Cable modem. I heard somewhere you need a router to do this. That's fine, I can buy a router for it. But I also want the two computers to be able to see each other (like transfer files between each other, and play multiplayer games). Does a router do this also? If not do I need to get a hub? I don't want to buy two pieces of equipment and have to switch cables between 'em to make it play multiplayer, or to use internet.