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Microsoft Knowledge Base Article 301677 contains the following summary:
This article contains descriptions of various security-related and auditing-related events, and information about how to interpret these events. These events will all appear in the Security event log and will be logged with a source of "Security." The following article in the Microsoft Knowledge Base is Part 1 of 2:
299475 Windows 2000 Security Event Descriptions (Part 1 of 2)