It's Java - see:<p><a href="http://www.mobileread.com/forums/showpost.php?p=639899&#38;postcount=6" rel="nofollow">http://www.mobileread.com/forums/showpost.php?p=639899&#38;p...</a>
<a href="http://www.mobileread.com/forums/showthread.php?t=61093" rel="nofollow">http://www.mobileread.com/forums/showthread.php?t=61093</a><p>For some previous attempts to hack apps together. It uses a modified AWT for display. The problem has always been that the API was heavily obfuscated.