Many Thanks to All. I have 3 computers at the moment, all using 56k modems. I can connect any of them, only one at a time of course, by connecting all the modem cables to splitters. It works fine. I was wondering if I could just do the same with ADSL when I get it.
By just using a USB modem, and only connecting the one I want to connect to the internet, it sounds like I could. However, the way I see it is, if I wanted more than one computer to connect at any one time, I would have to put in network cards and use a Router/modem