Wireless GPO configuration

I would like to deploy a wireless GPO to my wireless users in an Active
Directory environment.

If someone can share a link on how to deploy an automatic configuration to
wireless Windows XP SP 2 clients that would be great.

I also would like to know if a non domain windows XP SP 2 computers come
into the wireless radius environment how does Windows know its not an Active
Directory domain member?

I understand that computers can perform the authentication but does that
mean that for a split minute the non domain windows XP SP 2 computer actually
got on the network to authenticate?

Thank you,

Juan Ruiz