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here: http://arduino.cc/en/Reference/SerialEvent
here: http://arduino.cc/en/Tutorial/SerialEvent
here: https://groups.google.com/a/arduino.cc/forum/#!topic/developers/-joR59Xp6ho

and a cheap...

you can use the builtin serialEvent to trigger a callback when data is available. It works from the yield function which is called throughout the core so it will simulate using the actual isr. You...

probably write your own handlers that is specific to what you need but you haven't given an example of what your trying to do (Forum Rule)?