4:   What do these mean: etc/SERVICE, src/config.h, lisp/default.el?

  These are files that come with Emacs.  The Emacs distribution is divided
  into subdirectories; the important ones are "etc", "lisp", and "src".

  If you use Emacs, but don't know where it is kept on your system, start
  Emacs, then type "C-h v data-directory RET".  The directory name
  displayed by this will be the full pathname of the installed "etc"
  directory.

  The location of your Info directory (i.e., where on-line documentation is
  stored) is kept in the variable Info-default-directory-list.  Use "C-h v
  Info-default-directory-list RET" to see the contents of this variable,
  which will be a list of directory names.  The last directory in that list
  is probably where most Info files are stored.  By default, Info
  documentation is placed in /usr/local/info.

  Some of these files are available individually via FTP or e-mail; see
  question 20.  All are available in the source distribution.

  WARNING: Your system administrator may have removed the src directory and
  many files from the etc directory.