Your colleague is going to Google it for you on her BlackBerry. But in the meantime, my understanding is as follows.
When transmissions are sent over the Internet, those transmissions have two components: headers and payloads. The “header” is basic identifying information, and in this case it was the identifying information of the network itself that we were attempting to collect. That is, for example, if you're in Starbucks there's the name of the router. The better example is you open up your laptop and you say, which Wi-Fi networks are around me--because all of your laptops have Wi-Fi built into them--and it says there are these five Wi-Fi networks. That's the information we were looking to collect, the name of the network and some associated technical information that relates to the network. That's the same information you see on your BlackBerry when you turn it on, and it looks for available Wi-Fi networks.
The other component is the actual data that get transmitted over that network. So, for example, if I'm surfing the Internet and I'm looking at vacation homes in Florida, the contents of the web pages that are transmitted are the payload data.
So that's the difference between “network data” and “payload data”. “Network data” is the name of the wireless hotspot, and “payload data” is the actual content of the transmissions sent over the network.
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