To answer your points in order: No reason it couldn't talk across the Internet, I guess, if you're comfortable sending your source code to whoever is running th

To answer your points in order: No reason it couldn't talk across the Internet, I guess, if you're comfortable sending your source code to whoever is running the server and dealing with network latency on your autocomplete. Yes, you could easily point your editor to a different server, this protocol is basically just an API spec. And lastly, yes, you would (likely) need a different server for each of your languages - this project just provides a way to let an IDE implement one API client that can be used with each different language's tools.