Do I Need Airport Express If Both My iMac and MacBook Have Airport Cards

Just ordered a new MacBook that has a built-in airport card. Also will be using my good old iMac (both running Leopard 10.5.6). Since both computers have the built-in airport cards, do I still need Airport Express so I can use a WiFi network? I've already set up an Airport WiFi network on my iMac so I can WiFi my iPod touch. Isn't it the same principle? Hate to waste money if I don't have to. Also, I've got another iMac in the house that also has an Airport card (also running 10.5.6). It's in the shop for repair now so I can't try this out to see if it works - but can I simply turn on airport and internet sharing on that mac and let it use the WiFi network already set up on my other mac? Hmmm??? Thanks for any help.

Basically what you have done is utilize OS X's Internet Sharing feature on your iMac. This turns your iMac into a "software" router. In this case, you MacBook (& other wireless clients) can access the Internet through the iMac so you do not need to get a hardware router, like an Express or Extreme base station in order to do so. The only constraint is that the iMac must be on for this to work.

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Do I Need Airport Express If Both My iMac and MacBook Have Airport Cards

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