The application pool identity is used for any server side code (ASP.NET, classic ASP, PHP, etc). You can configure the anonymous user to use the application pool identity as well so you only need to manage a single user. The application pool identity needs read access to the site files at a minimum, but will require write access if your application writes to disk. Dot net Training in Chennai | Cloud Computing Training in chennai | Linux Training in Chennai | Salesforce Training in Chennai