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Command: assign-id
  Assign new ID to client, or fetch current ID

Purpose: assigning ID to clients so server can respond to that client

Compulsivity: manditory (core infrastructure)

More documentation: doc/messages

Reference implementation: mds-server

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Command: intercept
  Sign up for reception of message

Optional header: Stop
  Stop reception of messages if `yes`

Optional header: Priority
  Signed 64-bit integer of reception priority (reversed of order)

Optional header: Modifying
  Send message asynchronously and await modification if `yes`

Optional header: Length
  Length of the message

Message: list of headers and header–value-pairs that qualifies
         a message for reception, all messages qualifies if this
	 list is empty

Purpose: filter received message for clients and servers
Purpose: assigned interception order for modification of messages

Compulsivity: manditory (core infrastructure)

More documentation: doc/messages

Reference implementation: mds-server

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Command: echo
  Echo back a message

Required header: Client ID
  Your ID, provided by `ID assignment`
  in response to `Command: assign-id`
  
Optional header: Length
  Length of the message

Message: message to echo

Purpose: debugging and testing
Purpose: network heartbeat

Compulsivity: recommended for network enabled servers

Reference implementation: mds-echo

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