title: Create transparent window with xlib that does not accept any input events or grab focus
body: <p>I'm currently writing a window manager, and I was wondering if it were possible to create a window that is overlaid on top of all the other windows, but does not take input focus at all. In other words, I'd ideally like to be able to draw on this window without taking any input.</p>
  
  <p>One approach would be to have the window manager call XQueryTree and then pass input (mouse clicks, keyboard input, etc) to the corresponding window. However, I wonder if there's a way to just prevent this overlay window from ever getting input events at all.</p>
  
  <p>Also, I'd prefer not to draw directly on the root window, as that would break the compositing manager.</p>