What's under the hood of node.js+browsersync?

Question

Node.js

The question is only theoretical, not practical:
How does the browser remotely on the same network refresh the page if I don’t press F5
How can the node.js server do such “arbitrariness” on other devices,
Or is it not a refresh at all in the browser, but some kind of “injection” "...
How does it work, open and close a connection?

Answer 1

https://scotch.io/tutorials/how-to-use-browsersync...