Yes, this can be done. Because of the distance and placement of the computers (upstairs and down) it would be best to use wireless for one of them.
Yes, this can be done. Because of the distance and placement of the computers (upstairs and down) it would be best to use wireless for one of them. You would need a wireless broadband router, one wireless network card, and one regular network card (unless they already have network cards in them). You connect the broadband modem (DSL or cable) to the router. Then connect the closest computer to the router through a regular network cable and the regular network card. Next you install the wireless network card in the other computer and follow the directions to set up the router to receive the signal.