Open up fake ports, confusing a hacker and giving you time to report them into their ISP
Port Listener XP is designed to open up fake ports.
When you open up fake ports the user who may attempt to scan you will see all these ports open and the program will be capturing there IP, time attempted and the port which has been connected to.
Once its caught them, it kicks them off that port and listens again. You may customize the colors of the warnings and the number of attempts before a certain priority should be displayed ( low risk, high risk ect ).