Yes, for years I wanted what you're talking about, a fully offline, LAN-based communication tool, tried many times but was unable to do it in a way that didn't

Yes, for years I wanted what you're talking about, a fully offline, LAN-based communication tool, tried many times but was unable to do it in a way that didn't require the user to have a PhD in distributed systems. In the end, I just want a tool that allows people to send things to each other easily when they're near. This tool achieves that and we can just ignore the fact that it isn't really LAN-based. Also being just a chat room with an arbitrary name you can invite people from external places to join your "LAN" chat, which can be useful.