The Dallas-Forth airport has wireless hotspots available for use with your laptop computer. This allows you surf the internet from a wireless connection asuming you have a wireles NIC card in your computer.
I just happen to pop it in and two different networks came up. T-Mobile had the best signal strength.
You have to pay a few bucks, (I bought 60 minutes for 6 bucks) but they also have yearly passes, monthly passes and day passes available. It was pretty cool for me because it gave me something to do while I am waiting for two hours for my flight to Miami.
Wi-Fi is way cool, by the way. I have a home network hooked up to my cable modem which lets me take my laptop outside and do some work from the back porch. I've even be known to do a little surfing while sitting on the throne! LOL
j/k. Just be sure if you set one up yourself to encrypt and secure the network.