These may have come up already, but the application sounds appropriate for
a portable app kind of architecture:
http://en.wikipedia.org/wiki/Portable_application
MIT's Piggy Bank application delivers the most extensive environment I
have ever seen through a browser, this might be a good place to look
around:
http://simile.mit.edu/wiki/Piggy_Bank
Piggy Bank is well worth poking around for lots of other reasons as well.
art
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