im afarid ntl only supply one ip address so you cannot connect 2 computers directly to the modem
you could connect the modem one of the computers and connect the computers together and run internet connection sharing on the computer with the modem
Or you may wish to invest in a broadband router which will enable to share your connection between mulitple computers
how much it costs depends if you would want wireless or not.
having a router gives you the advantage of not needing to have the second computer on to gain internet access.
http://www.ebuyer.com/customer/produ...duct_uid=35433
Or
http://www.ebuyer.com/customer/produ...duct_uid=51436
note there are many more to choose from those just happeend to be the first 2 i found!