From the code: 'Attacker - a TCP/UDP port listening program Click on the PORTS button to set up a list of TCP and UDP ports you want the program to listen on. Click the START button to begin listening. When the program detects a TCP connection request or receives a UDP datagram it displays a message in the top window pane. The IP address sending the data will be displayed and resolved in the bottom window pane (if it is not already there Double-clicking on an item in the top pane will highlight the IP address that the request came from in the bottom pane.' from the doc: 'Version 3.0 does not represent any additional functionality to previous versions of Attacker, it simply signifies the fact that Attacker has been acquired by Foundstone (http://www.foundstone.com).'