Whats the weirdest/coolest uses you can think of utilizing payload filtering/triggering? And quickly explain a little of how it works and perhaps how to impliment. My usage for it is to lock down ports to the world and selectively give me access to those ports at the ip address i am at , at that time using a web server and an http link i can click to activate my ports for the pc i am at. Whats yours ? BTW if you know of any real way to port-knock on windows i would prefer that but really the web interface is very handy for using on a restricted computer- a simple www.server.com/secretaccesscode/ and you just got your ports opened to your pc !