ComputerNewbie, yes you can have quite a few computers on one cable or dsl connection. some companies tell you if you want more, then you will have to pay for more ip's, you can get around this, ***disclaimer*** it is against their rules, so if they found out they could disconnect you.
the things is though, if you just have 2 or 3 comps doing normal surfing, the company will not take any notice. if you hooked up an entire apartment complex, they might start to wonder how any 1 person could do that much surfing