Resetting Password on MacOS

One of my friend called me and asked how could he reset the password on his macbook. quick browsing on google, found these interestings:

• http://support.apple.com/kb/ht1274
• http://sg.answers.yahoo.com/question/index?qid=20071012020748AAvXTi9

Not testing yet, but should be working since one of it is directly from Apple.