Consider world. I see the world, note some state of affairs, and I make some interesting proposition P which describes it. Another person now reads it.
What the other person sees is just P. This P is now just a linguistic structure in front of him: a string of symbols. He reads it and makes sense out of it according to rules of language and relates it to reality. I am interested in knowing what enables him to understand P, exactly the way I intended it to mean?
More simply, how does any reader know what the statement is talking about (intends to)? Of course, proposition P by itself has some meaning. I can call it a closed meaning. But what enables him to relate the proposition to the reality? How is P able to denote the reality, or how do we relate it to reality? Is this relation a property of language or a capability of our minds?