title: X11: Setting a window undecorated or always-visible via command-line
body: <p><a href="https://stackoverflow.com/q/1029027/710951">This question</a> mentions the tools <code>xdotool</code> and <code>wmctrl</code> which are able to <strong>change a window's geometry via the command-line</strong>. This OK.</p>
  
  <p>But, what if I want to do more advanced operations, for instance:</p>
  
  <ul>
  <li>Setting a window <strong>undecorated</strong>.</li>
  <li>Making a window <strong>visible on all desktops</strong> (omnipresent).</li>
  <li>Setting a window <strong>always visible</strong>.</li>
  </ul>
  
  <p>Are there any tools allowing me to do the things avobe <em>from command-line</em>?<br>
  I use <a href="http://openbox.org/" rel="nofollow noreferrer">Openbox</a> as my window manager.</p>