Local / LAN network/multiplayer?

Hi, I am wanting to make a "companion app" for a desktop application and wanting to know if/how I can communicate on the local network?

The C3 Multiplayer object states the following: LAN game support for near-zero latency gameplay, including support for mixed LAN/Internet games

construct.net/en/make-games/manuals/construct-3/plugin-reference/multiplayer

However, I cannot find any information on how this can be done?

Anyone in the know?

That refers to the fact that hosts and peers connect directly to reach other, therefore if your host and peers are on the same LAN, there will not be any internet related latency.

You still need to have an internet connection to utilize a signalling server to get connected to begin with however, unless you host your own signalling server on the lan.