suse8.2

[Ilkka Ollakka]

on suse 8.2 gdm2 sessions are in /etc/opt/gnome2/gdm/Sessions
just create/copy XFce4 file there,give it execute permissions (like 
other file in there). from xfce-utils gdm sessions file includes:
--- XFce4
#!/bin/sh
########################################################################
#
# XFce 4file for GDM.  Usually in /etc/X11/gdm/Sessions.
#
# Add support for XIM; Modified by Babyfai Cheung.  2002/03/10 
########################################################################
## Launch an XIM input server if needed

# This's for RedHat and Slackware
for i in /etc/X11/xinit/xinitrc.d/* ; do
    if [ -x "$i" ]; then
        . "$i"
    fi
done

# This's for Mandrake
if [ -x /etc/X11/xinit/XIM ]; then
   . /etc/X11/xinit/XIM
fi

exec /usr/bin/startxfce4

---

-- 
Ilkka Ollakka