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what is the major reason for using gadget as most of the widgets are already available in thingworx. what is the need for it?
To use along with Dashboards, more information in the helpcenter http://support.ptc.com/help/thingworx_hc/thingworx_8_hc/#page/ThingWorx%2FThingWorxHelpCenterDITAFiles%2FThingWorxModelDefinitionandComposer%2FVisualization%2FDashboards%2FGadgets.html
How to create Dashboards with Gadgets
Even widgets can be used to create dashboards i suppose,so why specifically gadgets?