The VPN (Virtual Private Network) provider FrootVPN is beta-testing the Windows client for a tool they call “Kill Switch”. Essentially, whenever the VPN connection drops, there is a moment in time where the public IP address, not hidden through VPN, can be seen. As soon as the VPN reconnects, that’s no longer a problem.
What FrootVPN’s kill switch tool does is to kill the Internet connection as soon as the VPN disconnects. This can protect you from having your normal IP address exposed.