Microsoft Knowledge Base Article 317381 contains the following summary:
This article describes how to use the Event Query Script tool (Eventquery.pl file) to display events from Event Viewer
logs of Microsoft Windows 2000-based computers.
An event is any significant occurrence in the system, or in a program, that requires that users be notified or requires that an entry be made to a log. The Event Log Service records events to the Application, Security, and System logs in Event Viewer. Also, events are written to the Directory Service and File Replication Service logs on domain controllers, and the DNS Server log on Domain Name System (DNS) servers.
By using Event Viewer, you can obtain information about your hardware, software, and system components, and you can monitor security events on a local or remote computer. Event logs can help you identify and diagnose the source of current system problems and help you predict potential system problems.