I know there are ways to invoke javascript inside the html wrapper template for the flex application using ExternalInterface, but is it possible to reference an external html page?
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JavaScript, generally, operates on the page that is loaded/renderered in a browser. It sounds like you want to run a JavaScript function on a page that isn’t currently loaded/renderered in the browser. This would not be possible.
You might be able to do something with an embedded/hidden iframe in the html wrapper that loads your external page hidden from view. Then ExternalInterface should be able to access the HTML Wrapper which can access the iFrame.