HowTo: quit an emacs --daemon

[T. V. Raman]

Now that Ihave started using emacs --daemon, I  kill emacs even
more rarely than I used to --- but sometimes Ido have to e.g.,
after rebuilding emacs from git/bzr.

In  those cases, quitting out of all emacsclient sessions still
keeps the daemon around -- and killing that process feels crude
-- it then leaves files like the emacs.desktop file locked. Is
there a clean way of asking a running emacs --daemon process to quit?

-- 
Best Regards,
--raman