Setting Lectora variables from an external HTML page

Does anyone know how to set Lectora variables from an external HTML (non-Lectora) page? I am trying to get test scores created in an external testing system (HTML) passed back to Lectora. I have tried using the Varvariable.set(___) but no success. I have tried accessing the page via an i-frame and as a GoTo Web address in a separate window.

 

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