driving me nuts part-3

Hi,
i have an application which is based on the windows login, but i would to achieve something like this:
if my user directly types any aspx page name like http://abc.com/History.aspx ?age=10
it should restrict doing it..! , right now i am using  windows login so there is no chance of doing Form authentication as per my undertanding.
please help me out 
 
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