void gtk_window_set_decorated ( GtkWindow* window, gboolean setting )
Sets whether the window should be decorated.
By default, windows are decorated with a title bar, resize
controls, etc. Some window managers allow GTK to disable these
decorations, creating a borderless window. If you set the decorated
FALSE using this function, GTK will do its best to
convince the window manager not to decorate the window. Depending on
the system, this function may not have any effect when called on a
window that is already visible, so you should call it before calling
On Windows, this function always works, since there’s no window manager policy involved.