Thanks guys, so it looks as though I need two wireless routers and appropriate networking cards, if I want to "share" my broadband and printer, without having to leave desk-top switched on all the time.
Why do you need two wireless routers?
Yes, you will need a network card in each computer. These will be wireless or copper depending on your circumstances.
Your choices for the printer are either to get a dedicated network print server that can be wired or wireless, or get a single unit that is a combined: broadand router, wireless access point, 10/100 switch, firewall and print server (parallel or USB) - delete as appropriate.
SD