Emacsen
-------

   Gnus should work on :

   * Emacs 19.30 and up.

   * XEmacs 19.13 and up.

   * Mule versions based on Emacs 19.30 and up.

   Gnus will absolutely not work on any Emacsen older than that.  Not
reliably, at least.

   There are some vague differences between Gnus on the various
platforms:

   * The mouse-face on Gnus lines under Emacs and Mule is delimited to
     certain parts of the lines while they cover the entire line under
     XEmacs.

   * The same with current-article marking--XEmacs puts an underline
     under the entire summary line while Emacs and Mule are nicer and
     kinder.

   * XEmacs features more graphics--a logo and a toolbar.

   * Citation highlighting us better under Emacs and Mule than under
     XEmacs.

   * Emacs 19.26-19.28 have tangible hidden headers, which can be a bit
     confusing.