Interpreting Userenv.log file

https://blogs.technet.microsoft.com/askds/2008/11/11/understanding-how-to-read-a-userenv-log-part-1/

https://blogs.technet.microsoft.com/askds/2008/11/11/understanding-how-to-read-a-userenv-log-part-2/

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Very good exchange article collections - Exchange Insider Articles.

http://technet.microsoft.com/en-us/library/aa996113.aspx

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Domain Controller Location Process

http://www.microsoft.com/technet/prodtechnol/windows2000serv/reskit/distrib/dsbc_nar_azuo.mspx?mfr=true