What is a good reference document for the system sprocs on SQL Server 2008r2?

rhservan used Ask the Experts™
I am having difficulty finding a good source for the system sprocs and what they do.  Is there a document available that I can reference online or download?
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2nd Line Engineer
http://msdn.microsoft.com/en-us/library/ms187961.aspx  <<< would be no different than 2012 I suppose though a bit of enhancements

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