title: Is it possible to generate duplicate UUIDs in the same millisecond?
body: <p>Is it possible to create two duplicate UUIDs one after the other? I'm unfamiliar with how UUIDs are generated, but I would guess that if you created two separate UUIDs from the same MAC address in the same millisecond, then they would be exactly the same. Is this true?</p>
  
  <p>I guess I'm asking two questions in one. I'm very interested to know what parameters are used to generate a random UUID. I'm guessing its more than just timestamp and MAC address.</p>