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You can also set up the Emacs Info reader for dealing with the results of Octave's `help -i'. For this, the package gnuserv needs to be installed, which unfortunately still does not come with GNU Emacs (it does with XEmacs). It can be retrieved from any GNU Emacs Lisp Code Directory archive, e.g. ftp://ftp.cis.ohio-state.edu/pub/gnu/emacs/elisp-archive, in the packages subdirectory. A recent version of gnuserv is available from http://www.meltin.net/hacks/emacs/src/gnuserv-3.12.2.tar.gz.
If gnuserv is installed, add the lines
(autoload 'octave-help "octave-hlp" nil t)
(require 'gnuserv)
(gnuserv-start)
to your .emacs file.
You can use either `plain' Emacs Info or the function octave-help
as your Octave info reader (for `help -i'). In the former case,
set the Octave variable INFO_PROGRAM to "info-emacs-info".
The latter is perhaps more attractive because it allows to look up keys
in the indices of several info files related to Octave (provided
that the Emacs variable octave-help-files is set correctly). In
this case, set INFO_PROGRAM to "info-emacs-octave-help".
If you use Octave from within Emacs, these settings are best done in the
~/.emacs-octave startup file (or the file pointed to by the Emacs
variable inferior-octave-startup-file).