What is the relation between the widget “PDF” and the external “XPDFViewer” 
(both in Pro Features)?  The latter offers more direct access to a few 
properties (e.g., totalCharacterCount), while the widget syntax is a little 
simpler.  It does not appear that a PDF widget is a PDF Viewer, at least the 
widget’s name is not recognized as the name of a viewer when I try to call a 
function like XPDFViewer_Get(viewerName,property).

So do I need either to create a widget or create a viewer?  And are there 
non-obvious reasons to do one or the other?

David Epstein
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