How do I detect ActiveDirectory Schema master from the command line in Windows Server 2003 and WS2k3R2?

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http://serverfault.com – This spectacular MSDN article details how to do it in C++. And it vaguely mentions some utilities that don't appear to be on my system at all, and gives no ideas how to do this from a regular Windows Server 2003 R2 or Windows Server 2003 domain controller. The need to detect an active directory schema master occurs because (even though I can't figure out how this happened) I am trying to run adprep as a step in upgrading from 2003 to 2008R2 or 2012 server level domains, but its first command that you run (adprep /domainPrep and adprep /forestPrep) should be run on something called the "Schem (HowTos)