This tool named Netcut is a well known Windows program that can cut off a person’s connection when connected in the same network.
The Netcut automatically runs at Windows startup through service and can be disabled from the program options.
About the Netcat tool is a computer networking utility for reading from and writing to network connections using TCP or UDP.
This tool is designed to be a dependable back-end that can be used directly or easily driven by other programs and scripts, see: Wikipedia.
You can use free or you can buy to extend Pro membership from 1$ to 9.9$ / year.
You can download it from the official website.