Not solved, but one step closer
Disabled desktop option "show icons"
Desktop1? becomes a dreadfull gnome-like background
(icones are still there), and it reverts to some mandriva
background image
xwininfo gives a new window ID wich is not 0x48 nor 0x1e00009
A terminal command such as below does not work
# root-tail -f -g 720x250+15+30 /var/log/messages -id newID_number
Desktop2 (or the other) revert to a uniform background color only
and now root-tail works with commands
# root-tail -f -g 720x250+15+30 /var/log/messages
# root-tail -f -g 720x250+15+30 /var/log/messages -id 0x48
In fact this desktop is such that xwininfo gives a window ID wich root 0x48
EDIT SOLVED see
http://www.linuxquestions.org/questi...hreadid=383583