title: Does X11 window transparency via RGBA work on Windows 7 via Cygwin/X?
body: <p>I would like to have an X11 program with arbitrarily-shaped transparent areas using RGBA (so that whatever is underneath those area shows through) running on Cygwin/X on Windows 7.</p>
  
  <p>Is this possible? If so, it is efficient ie the transparency gets mapped to Windows' analogous support for opacity or transparency keys somehow (or in some other way)?</p>