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if I recall correctly, on this board of the forum, someone gave a link to his page. On that link, there was a link that opened the BB Maps application. For obvious reasons, he did not explain the code but the source code of the webpage enables do do easy reverse engineering.
I don't have that discussion bookmarked but you should browse and find it easily.
The search box on top-right of this page is your true friend, and the public Knowledge Base too: