The last true DOS that I used under Windows Me was PC DOS 7 from IBM. It came with a 597 page User's Guide plus there was complete system documentation on the hard drive. This more or less conformed with the documentation available for the various MS DOS versions I've used for the past two decades. Windows XP has replaced that with the Windows Command Processor which seems to have very different support requirements. While the power of each individual command seems to have been increased extensively (command /? tells me this), there does not seem to be any user manuals or online overall documentation available.
How can I learn this new batch (script?) facility. Are there any books or internal system documentation on the subject?