Explain what you would like to see improved

Add ability to run RBrowser and similar commands in "server mode":
When using on remote machines spawning browsers is inefficient and not desired. What could be useful is to just print the URL, which can be then opened in a browser on a different machine.

I apologise if this has already been reported/implemented. I can not find any reference to this in the code or documentation.

To Reproduce (ideal)

1. Run root --web=url.
2. Run ROOT::Experimental::RBrowser b.
3. Only URL will be printed which can be then used on another machine.