"Before we begin tinkering with the tools, you should clearly
understand the differences between stumbling and sniffing. They are
two very different activities, whereas each requires a different
kind of tool--we aren't talking about body parts.
"When you want to see what wireless access points (APs) are in
the area and their status, such as signal strength or encryption,
you want to stumble. You can even use stumblers as the chief tool
when designating or evaluating the location of APs on a wireless
network. Additionally, you can stumble around your office--while
not actually tripping--to find rogue APs. These are APs that
haven't been installed by the network team or have been reset and
are exposing your network. For personal motives, you can also use
stumblers to war drive. This means you drive (or walk or sit)
around in public to detect everyone's networks."