title: QListWidget synchronized using common datasource
body: <p>I have a main window with a mdiArea in it. In the area there are 2 subwindows, and possibly more. I want to have everyone have a QListWidget that shares the information and they are synchronized. I searched but I can not find any help.</p>
  
  <p>I was thinking of something like a static list, I want to share the data between all the sub-windows and allow anyone to work on them, 1 window at a time</p>