title: Where does the uniqueness of a GUID
body: <p>Very simple question.</p>
  
  <p>When a Microsoft GUID is generated, what part of GUID is considered unique? Take this guid for instance: </p>
  
  <pre><code>19C73070-400A-11E2-B017-3D05D2B0F3CE
  </code></pre>
  
  <p>I know that in a GUID it has 60 bits designated for a timestamp, 48 bits for a computer identifier, 14 bits of uniqueness, and six bits are fixed.  I just don't know which order these are in.</p>
  
  <p>What part of the above GUID could I use to get be unique?  Doesn't have to be unduplicatable, but enough to identify off of it.</p>
  
  <p>Thanks.</p>