For those who have been confused when calling the direct order line for Hayden to order The Internet Starter Kit for Macintosh and having Prentice-Hall Computer Publishing answer, my apologies, but don't worry. Prentice-Hall Computer Publishing is the parent company of a number of publishers, including Hayden, Brady, Que, and others. If you do wish to order directly, Hayden asked me to mention that they don't take Discover credit cards. They apologize for not making that clear before.
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.