in Settings-->Security & Privacy-->Advanced... button there are two tick boxes that the lower one is apparently about asking or not asking the password when you click on the lock icon, Am I right? Why does my mac always asks for a password while I wanna change settings? There no difference if I check or Uncheck this option, I am confused! so What does it do? BTW, Is there a difference between administrator and login password that I have? I only have one account on my mac with one login password, should I set an administrator password separately?