title: How to create a accurate chronometer, matching real time?
body: <p>I'm working in an educational software, mostly developed using Flash AS3, and we have a chronometer which shows different values through different users. 
  Example: Two users starting the chronometer at same time, but along some minutes of usage, they have different values.</p>
  
  <p>The current implementation uses Timer class, causing this to happen, obviously due the different average speed of each computer.</p>
  
  <p>I already have an idea in mind, but I would like to have some theoretical suggestions.
  Thanks in advance.</p>