The soon-to-be-released ZK 6.5 introduces new features that enable developers to design user interfaces that take advantage of tablet-specific user interaction methods such as swiping and changing device orientations.
Read here: http://blog.zkoss.org/index.php/2012/08/14/zk-6-5-tablet-ui-design/
Related reading: http://blog.zkoss.org/index.php/2012/08/14/zk-6-5-tablet-ui-design/