This feature allows server side applications to send system notifications (aka notifications bubbles) to the client.
It is supported on all platforms and controlled by the
notifications
configuration option.
python-notify
or
python-dbus
(the exact name of the packages required
vary)MS Windows XP:
MacOS 10.10.x:
Gnome-shell:
-d notify,dbus
xpra control :100 send-notification "hello" "world" "*"
will send the message to all clients.