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Xfce4-notifyd Notification service
Xfce4-notifyd is a notification service for the Xfce Desktop that implements the “server-side” portion of the Freedesktop desktop notifications specification. Applications that wish to pop up a notification bubble in a standard way can implicitly make use of xfce4-notifyd to do so by sending standard messages over D-Bus using the org.freedesktop.Notifications interface.
Where and how to report bugs.