What you need is something called a ROUTER. Using one creates a local area network (or LAN).
A router has one socket IN from the internet and a number of sockets OUT (4 or 8 usually) to your PC/laptops.
To the Router socket IN you plug your cable from the modem (this probably currently goes to the back of your PC).
To the router sockets OUT you plug each PC or Laptop you want to use the network.
So in effect the ROUTER splits the single internet connection to multiple PCs/laptops.
You need an ADSL router rather than a cable router used by those who have NTL/Telewest cable connections.
You can buy a WIRED router, where every PC has to connect to the ROUTER by a wire (called an ethernet cable or CAT5 cable).
You can also buy a WIRELESS router, where a PC / Laptop can connect to the ROUTER without a wire.
Most WIRELESS routers also offer a chance for wired connection if you want as well.
For a PC or laptop to use a router it has to either have a NIC (Network Interface Card) or a Wireless NIC. Most modern PC/laptops come with a WIRED connection built in.
If you have a modern laptop it may have a wireless conection already built in. If not you need to buy a wireless NIC card.
Once you have all this hardware you need to configure Windows networking, which is not that easy, particularly if you are not a computer expert.
But if you ask here people will help.



