What are all the user accounts for IIS/ASP.NET and how do they differ?

Under Windows Server 2008 with ASP.NET 4.0 installed there is a whole slew of related user accounts, and I can’t understand which one is which, how to they differ, and which one is REALLY the one that my app runs under. Here’s a list:

  • IIS_IUSRS
  • IUSR
  • DefaultAppPool
  • ASP.NET v4.0
  • NETWORK_SERVICE
  • LOCAL SERVICE.

What is what?

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