While I was using gnome2 in oS 11.4 I had the background set to a .xml
file, that simply loaded a background image. I had a cron job that
changed the contents of that image (the earth rotating according to the
current time), and simply touching the xml file caused gnome to reload
the png background image.

(gnome 2 had a sample xml file that changed the background image during
the day, darker colours at night. The xml file defined the hours on
which to do the change and the files to load)

I want to do something similar in XFCE under oS 12.1. It is simple:
there is an image that is regenerated every 20 minutes, but I need to
tell XFCE to reload it somehow.

Cheers / Saludos,

Carlos E. R.
(from 12.1 x86_64 "Asparagus" at Telcontar)