ZoneAlarm Pro 3.0 contains a redesigned interface for a smoother user experience with even stronger security. ZoneAlarm Pro 3.0 'hardens' security further with enhancements to its powerful Program Control feature. Program Control allows users to determine which programs are allowed to communicate with the Internet, thus preventing Trojan horse programs from 'calling home' and transmitting a user's information or opening a back door on the PC that a hacker can manipulate remotely. The Program Control feature in ZoneAlarm Pro 3.0 takes security a step further by not only 'fingerprinting' which programs have permission to access the Internet, but also fingerprinting the individual components of each of those programs to prevent hackers from abusing trusted programs.