This week a reader writes, “In (a recent) column you mentioned that you keep some of your passwords in your iPhone in a locked note. Could you please explain how one locks a note? It sounds So useful.

You probably already know how to password protect your computer, locking out other, but if you know how to password protect folders you can safely let others use your ...

The more levels of security you have on your Mac, the safer your files will be. This is particularly true if you allow multiple people to use your computer. For your most sensitive files, it's a good ...