This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
The Servlet API is just for systems which need to provide a web interface. It has nothing to do with hardware details, much as it has nothing to do with screen displays, sound, database access and so on. I guess you will probably need to write and/or use some native code to get this sort of information, and you are much more likely to get a sensible answer in the Java in General (advanced) forum, so I've moved this post.