I'm pretty sure in Flash 5 that the movie can use getURL() to receive data back without the browser being involved - there should be no need for the page to change for the user. This is how Flash-based chat rooms work, for example.
My feeling is that the quick hack I described above might be good enough for most purposes, but to do this stuff properly I guess this might be useful: http://download.macromedia.com/pub/solutions/downloads/elearning/scorm_flashlo.pdf
General developer forum
Adding a Flash resource type
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