My sister is using my wifi for her Macbook Air.

I have an Mac 24 desktop and my wifi is activated. My sister is visiting and I gave her my password to use the wifi, but everytime she closes the lid, then opens it again she has to request the wifi again. Is there a setting I must change or she must change to keep the wifi activated?

We've seen a number of threads on this forum pertaining to WiFi reconnection issues after the units awaken after sleep. Some users have reported that the problem was alleviated when they updated their systems to OS X version 10.7.3, while others have indicted that the upgrade did not solve the problem.
I can't say whether Apple classifies the problem as a "known issue" that they are hard at work solving. But I hope they are. I'm certain that related WiFi issues are being worked on though.
Here are a couple of things to try:
1) System Preferences > Network > WiFi > Advanced > TCP/IP tab: Configure IPv6 "Link-local only".
2) If you are wusing WEP encryption, switch to WPA2 on your router, and configure all the connecting computers to use this as well when connecdting to that network.

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