KisMAC is a passive network scanner. Instead of sending requests for active probe, charging the wireless card to tune to a channel, listen for a short time and then tune the next channel, listen a little, and so on. Thus, not only can detect networks without announcing their presence, but are networks that do not meet the requirements of the probe, ie, "closed" networks (AP marked disabled people). But that's not all. Passive Monitors have access to all the radio frames can be heard while listening on a particular channel. This means you can not only detect access points, but also the wireless clients of these access points.