This is the central location for documentation on the OpenEMPI software. The documentation is constantly evolving so if there is something you are looking for that you don't find here yet, just ask by posting a request on the forums. If you have figured out how something works that is not documented here yet, you can contribute a section.
The documentation is broken out in sections by architectural subsystem of the software. The goals is that there is going to be at least one page below for each subsystem that the users must interact with such as the User Interface, the Web Services layer, and the Java API.