liveview is similar, in spirit, to how X11 apps had a client side library and a server side library (ultimately Xlib on one end), and were connected by a socket

liveview is similar, in spirit, to how X11 apps had a client side library and a server side library (ultimately Xlib on one end), and were connected by a socket (bidirectional) over which minimal-ish data would fly back and forth to keep the client side displaying what the server wanted, and the server aware of events from the client side. liveview is also using a socket, whose existence springs to life via the "websockets" modernization where the client is a browser. and the traffic bidirectional over the socket again keeps the server side library aware of events, and the browser-side aware of UI alterations to display.