I think this would be very useful to know in case myself or any of my friends ever forget our password or for some other reason end up locked out of our computer. I could simply change the password to an existing account and problem solved.
However, while trying to do this it asked me to put in the password for one of my user accounts. I do know my password, but considering my reason for wanting to do this in the first place that kind of defeats the purpose.
Edited by Kuro, 30 January 2013 - 12:21 PM.