Creating a *top* level window, GTK/GDK/OpenGL...

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http://www.linuxquestions.org – Hi! Is it possible to create a window (with GTK+, GDK, or by using OpenGL, or Clutter) that stays on the top of all the other windows, even over a full-screened window? I want to create a small window that remains visible when I enter the full-screen mode of a video player (VLC for example). Thank you in advance! (HowTos)