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    Information Research Services Updated: 20 August 1997
         
             
                 
              May:
RSX-11D, a real-time operating system for online data acquisition, monitoring and control on the PDP-11, is introduced.
                 
              July:
RT-11, a real-time operating system for monitoring and control, is introduced.
                 
              September:
DIGITAL develops
DEC Data Communications Message Protocol (DDCMP) as a standard for its future computer-to-computer communications.