Correct.[quote] So is it is possible to just use the laptop to initialise the connection, using the settings from her ISP etc , then unplug the cable? [/quote]
yes Connect the laptop to the router via an ethernet cable .most routers will allow you to use either a crossover or straight through cable. check the manual to confirm.
set the laptop to get an IP address via DHCP and it will get one from the router, open a browser and enter the router address which is usually http://192.168.1.1 or similar .
login using the defaults which are usually admin - admin.
configure the internet connection . usually this just means entering the account username and password and possibly the PVC settings which for the UK are VPI =0 and vci = 38 and the type is PPPOA (maybe PPPOE in the US , again check the manual ).
make sure the internet connection works and you can surf the internet using the wired connection.
next set up the wireless.
while still wired to the router open the router admin page and click on the wireless tab. enter a name for the wireless network, this is called the SSID and is case sensitive,
leave the rest at the defaults for now,
on the laptop open the wireless client software and scan for available networks.
you should see the network name -SSID - you entered earlier.
try and establish a connection which should just mean double clicking on the name.
you should get a succesful wireless connection and both cards - ethernet and wireless - are connected to the router and should have DHCP ip addresses.
confirm this by opening a command prompt (start->run->cmd) and entering ipconfig /all (on xp and 2000 anyway ) .
you should see both cards listed each with an ip address in the DHCP range eg 192.168.1.10 and 192.168.1.11
now either pull out the ethernet cable to the wired network card or disable it using the network control applet/.
you should be surfing the net via wireless only.
leave the cable unplugged and permanently disable the ethernet card (this can be reversed at any time),