How do I associate files with Emacs (i.e., use Emacs as a server with gnuserv/gnuclient)?
You can use a package like gnuserv to associate files with Emacs so that opening a file outside of Emacs (e.g., by double-clicking on its icon) will create a new frame in a running Emacs displaying that file. It now works on all the Windows platforms that NTEmacs supports, and has a number of usefull features.