Rules in the Main tab define how the firewall will behave in the following situations:
When application is about to start — application startup
When application has been modified — modification of application's executable file (by the startup a check-out summary of the executable is performed and it is compared with the summary stored in the Kerio Personal Firewall database)
When application is about to launch another application — startup of another application by the running application
One of the following options can be set for each of the situations:
automatically permit the action — Kerio Personal Firewall does not block application startup (it accepts change of the executable file)
use existing behavior blocking rules or ask me — a behavior blocking rule for a particular aplication will be used (if it exists) or user will be asked (refer to chapter 5.3. Starting/Replacing/Launching other application Dialog)