Anonymous impersonation for FBA portals in SharePoint

We all get used to grant IUSER_computername any access we need as IUSER is the internet users that all anonymous user are impersonating when they try to access any page in your portal, and it works for only windows authentication. To do the same thing but with forms based authentication you need to
1- Store or register your IUSER for example guest to your membership repository.2- Grant that guest any access rights you want inside or outside SharePoint.3- Write some code to make all unauthorized users impersonate that guest inside the portal 'Global.asax'. which is protected void Application_AuthenticateRequest(Object sender, EventArgs e) { string cookieName = FormsAuthentication.FormsCookieName; HttpCookie authCookie = Context.Request.Cookies[cookieName]; if (authCookie == null) { FormsAuthentication.SetAuthCookie("guest", false); } }So all the anonymous users will have a guest access 'your created guest' on your portal
For more details see the link below.
http://blogs.devhorizon.com/reza/?p=508