Excellent Wireless Security Tool

http://www.lucidlink.com

Quote:

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The Free LucidLink WiFi Client makes it easy to connect to WiFi networks, automatically detects the required WiFi security settings, and warns you about insecure or dangerous networks.

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Seems quite handy for connecting to unknown networks.. (will it stop others though from connecting to a certain Wifi stream?)

Doubt it, as its a client-side software.

Blocking access is the job of the Router / Access Point.

Most routers these days seem to be coming with more common features, such as MAC Address white/blacklists. Which is the only real way you're gonna secure a wireless network from getting jacked by neighbors, etc.