NetStumbler (also known as Network Stumbler) is a tool for Windows that facilitates detection of Wireless LANs using the 802.11b, 802.11a and 802.11g WLAN standards. It runs on Microsoft Windows 98 and above. A trimmed-down version called MiniStumbler is available for Windows CE. NetStumbler is commonly used for: Wardriving, Verifying network configurations, Finding locations with poor coverage in one?s WLAN, Detecting causes of wireless interference, Detecting unauthorized (?rogue?) access points, Aiming directional antennas for long-haul WLAN links .....(free).....