A human interface configured to optimize a biomechanical effect of a human user's opposing thumb and fingers by including, on one surface, one or more software configurable input elements manipulatable by a user's thumb(s) or a stylus, and, on another surface, one or more software configurable selection...http://www.google.com.hk/patents/US7218313?utm_source=gb-gplus-share專利 US7218313 - Human interface system
