Emacs has a great "daemonization" feature which allows the user to connect to a currently-running Emacs instance ("the server") in a "client". The running client looks and feels just like a regular Emacs instance.

Creating an Emacs daemon is straightforward. The emacs --daemon command will create a new emacs daemon instance. Running the command server-start from within emacs will 'daemonize' the current emacs instance, allowing new emacsclients to connect to it.

Multiple daemon instances can be run, each with a unique name. A client may then specify which emacs server to connect to via the -s <servername> option. That way, you can have as many Emacs instances running as you want, and connect to them freely.

However, naming Emacs daemon instances is not straightforward. There is a variable, server-name, which controls what the server will be named, as long as it is set to that at the time of daemonization. So, launching a new Emacs instance from the command line was really awkward. The easiest method I had found is something like:

emacs -e '(setq server-name "my-special-server")' --daemon

This code sets the server-name variable before daemonization starts. This works, but is awkward. You also need to deal with quoting the code, which is also awkward.

One day, it struck me: what if --daemon takes a name as an argument, but this just isn't documented anywhere?

As it turns out, it does. The above may be accomplished by the following, which is much more attractive:

emacs --daemon=my-special-server

Suddenly, launching new Emacs servers is much easier.