The easiest way to accomplish this is to purchase a four port router.  Several companies make these at a reasonable price, and they can be found at several stores, including Circuit City and Best Buy.  If you purchase one, you would disconnect the DSL modem from your first computer and connect it instead to the router.  You then plug each computer into one of the four available Ethernet ports.  It will likely be necessary to turn off the power to the DSL modem for a few minutes when you do this so that it can learn the address of the router.

 

Thanks Jack,

 

Seems pretty straight forward. I'll check out the routers.and your installation.

daswede