Event logs consist of a header, a description of the event (based on the event type), and optionally, additional data. Most security log entries consist of the header and a description.
Event Viewer displays events from each log separately. Each line shows information about one event, including date, time, source, event type, category, Event ID, user account, and computer name.
For more information about Windows NT Workstation events, see the Messages Database Help file on the Windows NT Workstation Resource Kit 4.0 compact disc.