Changes by: Mihai Florian (mflorian at cs.caltech.edu)
Date: 2008-02-14 16:36:26 -0800 (Thu, 14 Feb 2008)
Revision: 12732
Log message:

      Implemented some parts of DIO.
     I still need to implement the authority policy.
     I also need to set some timers to handle message timeouts.