CallerIP scans all the ports on your system and alerts you to any mailicious backdoors or active web services which could provide unauthorized access. For Windows XP systems the program name is also identified, which helps you determine if the process is legitimate. Harmful backdoors may be installed on your system without your knowledge, possibly disguised as a legitmate program, or by visiting a legitimate website that has been infected by a worm or virus. Many users then inadvertently allow these programs to access the Internet through their firewall, which enables an attacker to gain access to their system. By monitoring all active connections to and from your system, CallerIP helps identify threats that may not be detected by a firewall. CallerIP should be used in addition to a firewall and anti-virus program for added protection.