Kerio Personal Firewall is a small and easy to use system designed for protecting a personal computer against hacker attacks and data leaks.It is based on the ICSA certified technology used in the WinRoute firewall. The firewall itself runs as a background service, using a special low-level driver loaded into the system kernel. This driver is placed at the lowest possible level above the network hardware drivers. Therefore, it has absolute control over all passing packets and is able to ensure a complete protection of the system it is installed on.