heya catman;
erm if i understand correctly what you are asking the answer is no.
Depending on wether your ISP is giving One, or more then one IP adress you can do the following:
If your ISP is only giving you one IP adress for free then you will have to buy a router and network your computers that way, or you can run a gateway server with two NIC in it with DNS and all that jazz, but thats more complicated then you probably want to deal with if you dont know what your doing, otherwise you will have to contact your ISP and ask them if they allow you to use a router on your side of the network or if this violates the TOS, and also what type of router will work, some require a cable/dsl router and some will work on a normal router.
If your ISP gives you more then one IP adress for free then you can just use a switch or a hub and it will automatically connect all computers to the internet with default TCP/IP settings with no configuration required.
XeeN