Autofill has the ability to run in a redundant mode : Several Autofill instances may run independently, regardless where they're running (same computer or dispatched across several machines).
This feature allows to :
-Provide a fault tolerance behavior,
-Increase processing speed /capacity,
-Manage process priorities.
The key point of Redundant mode is the choice of a common shared path, where a common history file is shared among Autofill instances running the same Option Set. The path must point to a target folder with write access/lock rights granted.
All Autofill's instances of a redundant group must use the same name for the option set.
Click on 
to choose the shared folder.