I was under the impression that you couldn't even get viewer data
unless the viewer has your app installed. Thus, if you have a viewer
object, you know the viewer has the app installed. If attempting to
grab the viewer fails, they don't have the app. A viewer.hasApp()
function might not help much... if you had a viewer object and were
able to call that method, you would already know the answer before
calling hasApp()!
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