What is needed to network 2 computers using Airport card

I know I need an airport card in my eMac, but is there any other cards that have to be in the computer? I want to network my eMac with an iMac using a DSL line. The eMac will be downstairs and the iMac will be upstairs. I'm waiting for delivery from Apple of the iMac. It has everything built in that is needed to network but my eMac doesn't. To make my eMac wireless is all I have to buy is an Airport Card and a Wireless Gateway for the iMac which is the computer connected to the DSL modem and Wireless USB adapter with connects to the eMac? What type of Airport Card do I need to buy for my eMac (model #'s etc.) It is the card that inserts above the super drive in the front of the computer. Is there any software that is needed to install Airport?

I am also doing some configuration changes (we have one Imac and two eMac's)
but one eMac does not have a airport card and is hardwired (ethernet) to the high speed cable modem then a apple airport. One Imac and the Emac with a airport card work fine, it is a bit tricky finding the correct airport card (or airport extreme card if you have a ATI graphics card (use about the mac/system profiler then click on more to see if you have a graphics card (which affects which airport card you need, there are alot of resellers on the net so you should find what you want.
If in doubt there is a free program mactracker which provides data on every mac made (available off off versiontracker.com (free site just register) it will guide
you on the type of card needed. I was quite amazed at the amount of different spec eMac's made in their relativealy short history.
Macwireless.com does sell eMac cards (for two models) but also antenna type
or flash drive appearing USB based wireless connectors that may help.
I found the mactracker program helpful (alot) as alot of web sites provide some vague info and I would hate to se you get stuck with a non returnable card.
The actual card install does not look hard (its done through the cd rom drive door.
I am not sure why we did not get a airport card for ours when we bought it.
Wish I did as it would have saved some $ (maybe) and surf time making sure I find the right one.
We did have a antenna wireless antenna for a "green" Imac (long gone) and it ran on OS9 but it was finicky when we had the airport base station upstairs
and the Imac and antenna in the basement (about 50-75 feet)
Best of luck
Hope this helps, I am not a expert, the serial number on the cd drawer will
nail down the model you have and what you need.
We have been working adding a laser printer and airport express and the two macs with cards work fine but the Emac with no card can not be set up yet. The laser printer will sure save on ink!

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