[WSS]WSS/MOSS ULS log and how to read and write it

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Eli Robillard has given a good blog entry introducing the WSS/MOSS ULS log which is important for sharepoint troubleshooting:

#SharePoint Trace Logs and the Unified Logging Service (ULS)
https://weblogs.asp.net/erobillard/archive/2008/07/31/sharepoint-trace-logs-and-the-unified-logging-service-uls.aspx

Also, there is code sample in MSDN about how to write custom provider that helps write custom messages into ULS log:

#Trace Log Example
https://msdn.microsoft.com/en-us/library/aa979522.aspx