HTTP Module and Cookies in Sharepoint 2007

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I have some proof concept code for a HTTP module. The code checks to see if a cookie exists, if so it retrieves a value, if the cookie does not exist it creates it and sets the value.Once this is done I write to the screen to see what action has been taken (all nice and simple). So on the first request the cookie is created; subsequent requests retrieve the value from the cookie. When I test this in a normal asp.net web site everything works correctly