Simple Question

Hi everyone,

I would like to build a wireless infrastructure out of the internal
domain (just to provide internet access).
I setup a new domain (out of the internal network) and installed the IAS
Server and the Certificate Authority in the same server.
Users have access to the internal network (joined in the internal
domain) and sometimes they will need to have access to the wireless network.
Is it possible? My intention is that they could access the internet even
when they are unplugged from the internal network.

Does anyone know a link, or document that explains this configuration?

Best Regards,

Marco