When any significant event occurs on a computer, the OS writes that event to a log. Event Viewer (eventvwr.exe) is the repository of these event logs. Most administrators open Event Viewer only to try to solve a serious problem, and many administrators tell me they use this tool only on servers. Both practices are administrative mistakes because checking event logs periodically can frequently catch problems before they become serious. Knowing how to use Event Viewer is an important skill...
http://www.winnetmag.com/WindowsSecurity/Article/ArticleID/41669/WindowsSecurity_41669.html

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