Also, to use the XPression Desktop Preview widget in DashBoard, you need to configure XP and add a Desktop Preview Output to it.
In XP, go to Hardware Setup. In the Input/Output tab, click on "Add at the bottom left". In the popup, select "XPression Desktop Preview Client" as the brand. Click on OK, then enter the DashBoard Host IP and Channel you want to monitor.
But that should give you just a thumbnail, and not a full live preview.
#DashBoard