iBus 1.1.0 reference manual. The latest version of this documentation can be found on-line at http://code.google.com/p/ibus. The iBus API consists 3 parts: User interfaces for objects and services which are relateed to iBus UI such as language bar; Input method engine for input method main logic and input/output handling; Configure for services for save, load and listening configures. These APIs directly related to User interfaces, such as pre-edit buffer, auxiliary text, language bar, button, radio boxes, and so on.