Methods for realizing advanced graphical user interface (GUI) in panel subunit. The present invention defines, in one embodiment, a focus in user action and a focus out user action for panel subunit. The focus in/out user actions, when received by a controller device, are then passed to the target device....http://www.google.com.au/patents/US6295479?utm_source=gb-gplus-sharePatent US6295479 - Focus in/out actions and user action pass-through mechanism for panel subunit
