RFC 441 (rfc441) - Page 2 of 7

Inter-Entity Communication - an experiment

Alternative Format: Original Text Document


RFC 441                Inter-Entity Communication           January 1973


              +------+
              | USER |
              | TTY  |
              +------+
                |   |
   -------------|---|--------------+
                |   |              |               +-------+
        +------------------+       |               | HOST  |
        |     COMMAND      |       |               |   A   |
        |   INTERPRETER    |       |               +-------+
        +---+-+-------+-+--+       |                   |
        TTY |_|       |_| TTY      |                   |
    OUT-PORT ^         | IN-PORT   |                   |
             |         |           |                   |
             |         V           | +--------------+  |
                                 +-|-+              |  |
                            <----| |IN-PORT         |--+
                                 +-|-+              |
                                   | |  CONSULTANT  |
                                   | |     #1       |
                                 +-|-+              |
               I.E.C.         ---->| |OUT-PORT      |
                                 +-|-+              |
                                   | +--------------+
                                   |
                                   | +--------------+
                                 +-|-+              |
                            <----| |IN-PORT         |--+
                                 +-|-+              |  |
                                   | |  CONSULTANT  |  |
                                   | |     #2       |  |
                                 +-|-+              |  |
           ^          |     ---->| |OUT-PORT        |  |
           |          |          +-|-+              |  |
   JOB     |          V  JOB       | +--------------+  |
   IN-PORT+--+       +--+OUT-PORT  |                   |
     -----|--|-------|--|----------+                   |
     +----+  +-------+  +---------+                    |
     |                            |                 +------+
     |      USER     JOB          |                 | HOST |
                                                    |  B   |
                                                    +------+

   The user now has the option of opening or closing any of the ports he
   wishes.  While in conversation mode, he might turn off the ports
   leading to the JOB.  If he wished consultant 1 to control the job, he
   might turn off the input ports from his own TTY and from consultant
   2.



Bressler & Thomas

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