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The high elves, and Gandalf, certainly had much ability to communicate from long distances... see things that happen and perhaps send messages. They are mysterious that way. Galadriel sensed that Gandalf was not really dead somehow, certainly, and sent for him at Caradhras.

How many times in the story were messages sent on ahead by the elves, in mysterious ways we didn't really understand? The elves the the hobbits met in the Shire sent messages that reached Rivendell, and Galadriel knew the Fellowship had left Rivendell, even though no messengers could have beat the Fellowship there when they arrived... It is one of the mysteries PJ was interested in enough to show in the film.

Hair, I think Gandalf had an increased "6th sense", given his power as the mightiest Wizard, but did not necessarily posess the communication abilities that the Elder elves did. His posession of the Ring of Fire certainly augmented this, however.

Remember, he suspected that Bilbo's ring was The One, but was not certain until he researched Isildur's records in Minas Tirith.

Methinks Galadriel or Elrond (backed up as he is...lol) would have known right away.

My $.02 anyway.