edit  -- Command, no inputs.  Abbreviation: ed
     The edit command attaches to the user's kept Emacs and allows for
     editing of as many LOGO procedures as is desired. When Emacs pauses,
     LOGO is re-entered. Any procedures which are changed in Emacs should
     be written out to their disk file; LOGO will then get the changes
     immediately.
     
     You must have defined a logical called EMACS$NAME which translates to
     the name of your kept Emacs process so that the edit command can
     find the process and attach to it.

     Currently there is no provision for using another editor besides Emacs.
     Eventually, EDT may be supported.
