Property Display and Object Preview 
Display of Properties for Master iViews and External Services
You can display all the properties of master iViews and External Services. To do this click on the master iView or External Service in the selection list and choose View.
Preview of Master iViews, External Services and Pages
You can display a portal preview for a page, master iView or External Service. To do this, click on the corresponding object in the selection list and choose Open.