You're going to need to use what's called ICS which means "internet connection sharing". This requires some very specific IP addressing configurations. You'll need to modify these in your router and set your Dell to a specific IP address and your Gateway to a static address as well. MS has instructions on how to do this so I'll just give you these basics for now until you make your decision. A better way, if your Gateway has a card slot is just to get a wifi card for it as well. Sooooo much easier this way.
I have a dell laptop with windows and a mini wifi card. Also, a gateway with windows xp home 2002 service pack 3.
1. If I use a crossover cable, will I be able to use the laptops wifi connection on the gateway desktop?
2. If so can someone give me setup instructions for the two?