The matter of direct thought communication is discussed in Tolkien's essay "Osanwe-kenta", which appeared in one of the Vinyar Tengwars. I don't have the essay at hand, so I can't quote from it, but basicly it says that, if both parties open their minds willingly, thoughts can be shared between any two people. There are some obstacles, and problems, however, that prevent this from being done by Men (which I can't recall).
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