I don't know but out of the 3 OSes I have at home, OpenBSD, OS X, and XP, XP is the biggest piece of s*it when it comes to Wifi. I use OpenBSD on this IBM T40 laptop, NEVER lose my connection to my AP, my girlfriend sitting right next to me with her Dell D600 laptop with a variety of 802.11a/b/g cards (built-in Intel; Cardbus Prism 2, Atheros, Ralink chips, and various manufacturers using those chips) loses her connection far too often. I gave up troubleshooting her laptop.
My Mac and my OpenBSD T40 (I have XP on it but rarely boot it, when I do, I suffer the same problems my girlfriend does) work flawlessly. Every time she loses a connection I just point to mine and tell her I'd be happy to install OpenBSD for her.
Greg