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Seems to me that, given that the board is not always in the URL, the only way to do it is from the post number. That involved database access which is annoying (and at least a little time consuming since it's an extra database access per page). It would be cool if there were some environment-like variable available since someone has that information already.
Someone suggested a custom header for each forum that set a variable that could be accessed by the Island. I could not get this to work, but perhaps there is some global environment that can be set?