What do SPNs actually do - NAV 2009

Three terms keep coming up when setting up NAV 2009 when NAV-server (middle tier) runs on a different machine than SQL Server: - Delegation / Impersonation - Kerberos - SPN Delegation / Impersonation is what it says it is. Kerberos is handled more or less automatically by Windows. But what do SPNs actually do.... (un)fortunately SPN can't be explained without first explaining Delegation and... Read the full text.
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