Simply drag the duplicate window element onto the page you want the effect to apply. If a duplicate window/tab is detected, the "A duplicate tab has been detected" event is triggered. You can access this event within a workflow and show an alert, popup etc. Furthermore, you can also specify if the window/tab should auto-close once a duplicate window/tab has been detected. If you check this box, you can also specify the delay in milliseconds until the window/tab is closed.