How does an American Citizen apply for a "Residence Permit" to live in Greece

How does an American Citizen apply for a "Residence Permit" to live in Greece?
And how long are they good for? Where can I obtain one at? And what do I need before going to get one?
Immigration - 1 Answers
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http://www.expatforum.com/articles/visas-permits-and-immigration/greece-visas-permits-and-immigration.html

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