is as follows:
1. Buy a wireless router.
2. Then buy a wireless network adapter for your laptop. You can get both PCMCIA card types, or external USB types - both work just as well, but if your laptop is fairly new it may well have an internal wireless adapter already installed.
3. Buy a wireless adapter for the PC - again you can get USB external models, or an internal PCI card adapter with a little aerial that sticks out at the back of the computer.
4. Install everything - the router connects to the ADSL microfilter on your phone line. If you're using USB adapters it is essential to install the software before you connect the adapter.
That's it - you should find that the adapters find the router and connect as soon as you boot up the machines - although with some models you'll be asked to select a wireless network from a list of one. If you are, and you're asked if you want to connect, even though the network may not be secure, say 'yes'.
The big advantage that a router has over a wireless access point (which looks much the same) is that you don't need to have any one machine running before you can connect on the other one - the router is permanently online and broadcasting. Most current routers have their own ADSL modem built in, older ones need to be connected via a separate modem.