Deciding whether we're running under Gnome

["Stefan Monnier" <monnier+gmane.comp.gnome.devel/news/@rum.cs.yale.edu>]

How can a program such as Emacs decide whether the user is currently
using Gnome or not ?  Emacs is not itself a Gnome application, but
it would be good for it to try and obey the user's Gnome settings
when applicable, but the user's Gnome setting should obviously not
be obeyed if the user is currently running KDE or yet-something-else.


        Stefan