You should have kept looking at the MSDN and TechNet, because the idea that there's no documentation because it has been forgotten, or indeed the idea that there is no documentation, is utter nonsense.

Windows Server 2012 Command-line reference:

* https://technet.microsoft.com/en-gb/library/cc754340(v=ws.11...

Windows XP A-Z Command-line reference, that is actually named that:

* https://technet.microsoft.com/en-gb/library/bb490890.aspx

Doco for the wdsutil and md commands, picked at random:

* https://technet.microsoft.com/en-gb/library/cc771206(v=ws.11...

* https://technet.microsoft.com/en-gb/library/cc754711(v=ws.11...

bcdedit command references:

* https://technet.microsoft.com/en-gb/library/cc731662(v=ws.11...

* https://msdn.microsoft.com/en-gb/library/ff542205(VS.85).asp...

And so forth. There's a huge amount of doco, including reference doco.