Used Listen-Listen for Windows?
Developer’s Description
By NetworkActiv
This system allows for easily enabling data sent from one client to be received by many other clients at the same time. The transmission is real-time, without modification or caching. All multiplexing scenarios are supported: one-to-one, one-to-many, many-to-one, and many-to-many.
Listen-Listen provides an easy-to-use graphical user interface so you can get your clients communicating in no time. Both IPv4 and IPv6 are supported. Per-client data counts are available for monitoring and troubleshooting.