Use the ASP.NET Impersonation Settings dialog box to specify the account your ASP.NET application should impersonate.
UI Element List
Type the name of the specific account that you want your ASP.NET application to impersonate.
Opens the Set Credentials dialog box, where you can specify an account name and password for IIS to use for ASP.NET impersonation.
Select Authenticated user to enable the ASP.NET application to run under the security context of the user account authenticated by IIS.