The operative word here is "share", and as such the basic hardware requirements would be:
1) A broadband modem with an ethernet out connection.
2) A wired/wireless multiported router.
3) Network cards wired/wireless in each machine.
The rest is software.
Hi, I'm hoping to set up broadband to share with my flatmates, but I find the list of required products rather confusing- some say you need certain items, some say you don't. I have Windows XP, and had no trouble connecting to the university's internet connection last year, which was also broadband. My question is, exactly what equipment do I need? Before I thought I'd only need a modem and a router, but now I'm not so sure. Any help would be greatly appreciated!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic