How do I create a wifi Network in a classroom without Internet.

Hi all,
I have an iPad, Iphone and a MacBook Air that I use in my PC-equipped classroom. I can get by without wifi, but several new apps have me wanting to use the iPad (or iPhone for that matter) as a mobile whiteboard. My problem is the adhoc network I can create with my MBA deactivates whenever I sleep the MBA. This happens severa times throughout the day as I'm not the only teacher using the room.
What I would like to do is use a spare Airport Extreme base station I have to create an equivalent to the adhoc netwerk, but on a permanent basis.
Is this possible, and if so how?
Thanks!

The AirPort Extreme....or any other AirPort does not need an Internet connection to create a local wireless network.
Simply configure the Extreme using AirPort Utility to "Create a wireless network" and ignore the messages that you do not have an Ethernet connection and/or Internet connection.
Once the Extreme is configured, you have the option to go back and click to "ignore" the "errors" and the indicator light will change from a blinking amber to green.
We can't provide any more specific configuration instructions without knowing what the model number of the AirPort Extreme might be (it is on the bottom), and which operating system the MacBook Air might be using.

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How do I create a wifi Network in a classroom without Internet.

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