Comment by lisper
You apparently missed this part:
"Just for the sake of completeness I should point out that removing duplicates at the receiver is a pretty extreme oversimplification of what you would do in practice to provide exactly-once delivery. A complete solution would almost certainly be an example of Greenspun's Tenth Law applied to the TCP protocol rather than Common Lisp."
Can you explain this point? I think you are trying to say the application would include an implementation of TCP? I don't see how this is related to memory.