Have you opened a doc? Unless there is a open connection to a document there won't be a handle for it.
To get one, from the global handle pick method OpenDoc and use that as a template. Insert a document name into the qDocName param. If you are using Desktop it would something like Executive Dashboard.qvf if you are using server then it would be the app guid.
Execute that request and you should see a new handle for that app in the list.