title: What happens if 2 or more people update a record at the exact same time?
body: <p>I'm using NHibernate with the version property that automatically increments every time my aggregate root is updated. What happens if 2 or more people update the same record at the exact same time?</p>
  
  <p>Also, how would I test this?</p>
  
  <p>Note that this isn't a situation I've been in, just wondering.</p>