The program functions as a sort of virtual hub. It listens on all network interfaces for outgoing UDP broadcast packets destined to the IPv4 address 255.255.255.255. When the program receives any such packet, it will send it on all network interfaces (other than the interface on which it is already being sent) that have a class C subnet mask.
In other words, when the program is running, outgoing UDP broadcast packets are sent from all network interfaces that have a class C subnet mask...