You plug the Speedtouch modem into the router, fit the PCI card into the desktop machine, and the PCMCIA card into the laptop.
That, very simply put is it.
Things you should know:
1. You can also buy external USB wireless network adpaters for both machines. Then all you have to do is plug them in.
2. Make sure that if you use USB adapters you install the software before you plug in the adapters.
3. The set up routine for the wireless router will be pretty easy, and involve connecting (temporarily) the router to one machine with the supplied cable. This is so you can set the router up - following the on screen instructions - and download the modem's firmware to the router. The latter procedure enables the router to initiate the connection each time it's booted.
4. You could abandon the Speedtouch modem altogether and get a wireless router with it's own ADSL modem built in. These are now very common, in fact they outnumber routers that don't have a modem. With one of these you connect the router directly to the ADSL phone line, and use the same wireless adapters as before for the two computers.
It all works very smoothly, and is almost easier to do than to explain. Everyone has their favourite routers and network adapters - I tend to favour Netgear routers and Belkin or Linksys wireless USB and/or PCMCIA adapters. You can buy some very neat little USB adapters that look like those USB 'pen' drives. Take a look around the wireless networking section at click here