I'm fairly new to Macs & confused how Airport works (I have an Airport Extreme, iMac, & a Windows desktop along with a Windows laptop in the house). I noticed when I turned off Airport on my iMac, it didn't disable internet to the other computers, only to the iMac (is that right)? Is there a way to disable internet to all computers without just unplugging the AE? Also, is there a way to keep internet on the iMac only (other computers having no access) without having to just switch the ethernet cable from the AE to the iMac? I'd appreciate any info.