To find out which NT account your app is running under at any given time, do something like (in VB.NET):
Dim User = System.Security.Principal.WindowsIdentity.GetCurrent.User
Dim UserName = User.Translate(GetType(System.Security.Principal.NTAccount)).Value
When using ASP.NET, this account will match the identity of the application pool, which you configure using IIS Manager. Note that the anonymous IIS user isn't much involved with ASP.NET requests.
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