There is a capability that is called a "Wireless Bridge" and according to Wikipedia:
'[b]Some users have cleverly connected a "Wireless Bridge" (i.e. a wireless router or Access Point set to the "bridge" mode) to the wired NIC card in their PC. The PC then netboots through the wired Ethernet NIC as usual, but the data is then transmitted from the NIC to the Wireless AP/Router connected to it and then wirelessly "across the bridge" to a central Wireless Access Point/Router.
This solution works pretty well, but of course you must have two Wireless Access Points/Routers (one on each side of the "bridge"), so costs will therefore start to increase. Still, this is sometimes easier than running extra Ethernet cables throughout your home.[/b]'
I would hasten to add that I myself attempted this configuration about a year ago. After spending funds sufficient to maintain a small Nairobi coffee plantation, I gave up in abject disgust at the numerous pitfalls I had encountered. :)