This view is a standard Eclipse view that ACTF uses to provide more details about tree items selected in the Inspection View. Use of the Properties View is documented in the Eclipse help. We won't attempt to describe the Properties View here but instead ACTF's use of it.
The contents of the view will vary depending not only on the particular element selected in the Inspection View, but also which "face" of the Inspection View from which the element is selected.
For elements selected in the Windows Desktop tree, there is only one category of properties: Accessible. The picture below shows the Properties View of such an element.
For elements selected in the Eclipse Desktop tree, there are two categories of properties: Accessible and Architecture. The picture below shows the Properties View of such an element, with the Accessible category collapsed.