gistfile1.txt

public class SecurityModule : IHttpModule
    {
        private const string Key = "PageAccessAllowed";

        public void Dispose()
        {            
        }

        public void Init(HttpApplication context)
        {
            context.PostAuthorizeRequest += (sender, args) =>
            {
                var disclaimer = StaticNodes.Disclaimer;
                if (context.Request.RawUrl.StartsWith(disclaimer.Url))
                {
                    return;
                }

                if (context.Session[Key] as string != null) return;
                if (context.Request.Cookies[Key] != null) return;

                context.Response.Redirect(disclaimer.Url, true);
            };         
        }
    }