title: Synthesized property and variable with underscore prefix: what does this mean?
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/5582448/underscore-prefix-on-property-name">Underscore prefix on property name?</a>  </p>
  </blockquote>
  
  
  
  <p>What does this mean? <code>@synthesize window=_window;</code> I know that in general it means that 'some class' has a window, but why use <code>_window</code> instead of just <code>window</code>? Is this a namespace thing?</p>