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[xubuntu] Information regarding connecting to a wireless network

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linux-howto

http://ubuntuforums.org – I am wondering what information is given to a wireless network when you connect to it. Let's say I went to McDonald's and used their open Wifi. What information do they receive? Or a public library, or maybe a school? I know they'd receive my MAC address, right? Maybe the machine name? What else? (Hardware)