title: Opening multiple documents in a same window with UNO
body: <p>I have script in python using pyuno that extracts data from many excel files. </p>
  
  <p>My problem is that for every file I open and close a window with </p>
  
  <pre><code>url = unohelper.systemPathToFileUrl(os.path.abspath(file_name))
  file = desktop.loadComponentFromURL(url, "_blank", 0, () )
  </code></pre>
  
  <p>and</p>
  
  <pre><code>file.close(True)
  </code></pre>
  
  <p>Is there any way to extract data from the files without opening a window at all? Or at least without opening a new window for each file?</p>