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The Xfce4-screenshooter is an application that can be used to take snapshots of your desktop screen.
This application allows you to capture the entire screen, the active window or a selected region. You can set the delay that elapses before the screenshot is taken and the action that will be done with the screenshot: save it to a PNG file, copy it to the clipboard, open it using another application, or host it on ZimageZ, a free online image hosting service.
This manual describes how you can use Xfce4-screenshooter, and how you can configure it to your preferences.