Wireless connection sharing

[NoOp]

I have a son that is a few hundred miles away attending college. It
seems that I am *always* trying to fix something on the wireless PCMCIA
card on his laptop (Gutsy); either poor quality connections, no
connection at all, or he tries to install a new card & of course he has
no connection to download drivers etc. He does however have a desktop
(Gutsy) with an old WUSB11v2 connector that works, so here is my question:

Does anyone know a simple, easy way that he can connect to the desktop's
nic (while the desktop is connected via wireless) to the nic connector
on his laptop in order to download drivers etc?

So:

Wireless desktop connection ---> desktop nic ---> laptop nic port.

If I can figure out a way to easily instruct him how to do this
(remotely remember) then at least I'd have a chance in fixing his
wireless problem(s) - he's just purchased a new WPC400N to try to
replace the Dynex so I'm sure that he will need a connection from the
laptop do download drivers, ndis bits etc.

Notes: he has access to the wireless router etc., he uses a free open
connection in his apartment complex to connect the desktop. Also, both
computers (laptop and desktop) connect just fine when using a hardwired
dhcp connection. Also, the WUB11 once worked on the laptop, but we've
fiddled with the settings to get Dynex and Linksys PCMCIA cards working,
and in the process the WUSB11 no longer seems to work on the laptop.