How a new computer can know the wifi passwords?

Recently, I installed a new Macbook Air for my wife. All installed / installation from the ground upward.

Now, here's the thing; next time I started it automatically connect to my wifi network secure at home. How is that possible? This new computer that has never been in my house, how can the password for my Wifi? Even worse, have a peek into the history of Wifi I can see hundreds of Wifi networks that I have connected to in the past - on my other devices! This computer has never had anywhere.

Thus, it seems that something is connect devices here and share this information. What I need to know is; How is that possible?

It is not possible. It must fail information. As you entered the password when you set up first of the machine. Or you have migrated info on starting a backup.

Tags: Mac OS & System Software

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