windows and anonymous authentication in a web site

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C#

VB

ASP.NET

C#4.0

Simply the question is how to use both windows and anonymous authentication in one application?
Im developing a website using asp.net(c# 4)(and going to publish it on iis7) , and i need to add both windows and anonymous authentication to that site. that mean if user call to app URL from domain PC user will login to the system without asking any credentials( using domain username and apassword), but if user call to URL from any otherpalce user will remain in login page, and user has to provide given username and password which are stored inside a database