So far, I have only mastered the notification of single users (using 
xmessage). I am afraid there's no ''xwall''. 2 Q&As that I found seem 
to confirm this:

X11 send notification to all users on all DISPLAY's - Unix and Linux
http://unix.stackexchange.com/questions/43212/x11-send-notification-to-all-users-on-all-displays

Show a notification across all running X displays - Unix and Linux
http://unix.stackexchange.com/questions/2881/show-a-notification-across-all-running-x-displays

HTH,
-- 
-- Andreas



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