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Thanks for your question. Which of our books are you using? The root user account always exists in OS X. You just need to enable it for specific administration tasks. The root user is discussed in detail in various places in both OS X Mountain Lion: The Missing Manual and Switching to the Mac: Mountain Lion Edition, but these instructions from Apple's support pages should get you what you're looking for quickly: http://support.apple.com/kb/PH11331
Senior Editor, Missing Manuals