1 html5 web socket
https://www.websocket.org/index.html
2 Microsoft ASP.NET signalR framework
https://github.com/SignalR/SignalR
3 webrtc
1 html5 web socket
https://www.websocket.org/index.html
2 Microsoft ASP.NET signalR framework
https://github.com/SignalR/SignalR
3 webrtc