Option-Click AirPort Menu for Network Details
If you hold down the Option key while clicking the AirPort menu in Mac OS X 10.5 Leopard, you'll see not just the names of nearby Wi-Fi networks, but additional details about the selected network. Details include the MAC address of the network, the channel used by the base station, the signal strength (a negative number; the closer to zero it is, the stronger the signal), and the transmit rate in megabits per second showing actual network throughput. If you hover the cursor over the name of a network to which you're not connected, a little yellow pop-up shows the signal strength and type of encryption.
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You can do only so much to prevent your Mac from being stolen, but with the FileVault encryption technology built into Mac OS X since 10.7 Lion, you can ensure that your confidential data — email, photos, financial information — is kept away from the prying eyes of a thief or anyone who comes into possession of your Mac.
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