Data Stream mode is for more advanced users who want to feed realtime data from the sensors into their program and manipulate the data, display it, save it, store it, etc. Our sample code is written in Processing, a popular, free, version of the Java language. We have provided a main programming file which is very clear and easy to use.
Go for it:
--Download the sample files. You must have Processing and Java installed. Processing is available at processing.org