Client with Window OS?

[Yam Biz]

-I want to have a small FreeRadius Server with AAA,
billing system but i don't have any NAS in NAS list,
can you advise me?
-Can i have i client with Window OS?
-How can FreeRadius supports billing system with
pre-paid or post-paid?
--Thanks so much-- 
Yam Biz

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