(Activeportsactivports - a free and easy-to-use tcp/ip and UDP port monitoring tool, which can display which programs have opened those ports, and display the remote IP address connected with the local IP. It can be used to detect Trojans and other hacker programs. "Activeports is an easy-to-use tool under windowsnt/2000/xp. It allows you to monitor all open tcp/ip and UDP ports on this machine. Activeports allows you to know which program is applied on which port)