title: Wait until user closes a file
body: <p>I have an excel file that I want the user to edit.
  First, I open the file to the screen for him:</p>
  
  <pre><code>os.startfile("C:\Users\user1\myfolder\Input.xlsx")
  </code></pre>
  
  <p>I want to wait until the user closes the file and only then continue with my script.</p>
  
  <p>How can I do that?</p>