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Unicode is a system developed to help make multi-lingual communications easier. When you press the letter 'A' on a western encoded keyboard, you will get the western letter 'A.' To get to the other letters (providing that the font has letters encrypted in their code. I forgot that Macs now ship with Ariel Unicode. If you go to the Applications folder and open Font Book you can see all of the different codes to reach the correct letters. You can also see them by going in the Finder and choosing Edit/Special Characters.
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This site has information about inputting Armenian characters direct from the keyboard.