Its integrated to the process when you promote the first 2012 dc in 2008 domain. If you wanna do it manually its almost similar to what applies to upgrading 2003 ad to 2008. Insert 2012 dvd to te schema master of 2k8 domain. Run commands adprep /domainprep,
adprep /forestprep. Only think you need to keep in mind is the O architecture should be 64 bit.
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