This hook is invoked whenever a PropertyNotify event is received\n\ for a window scwm is managing. This indicates that an X window\n\ property has changed. Watching for window property changes can be used\n\ to construct your own custom window manager protocols. The hook\n\ procedures are invoked with two arguments, the name of the property\n\ that changed (as a string) and the window that it changed for. See also\n\ X-root-PropertyNotify-hook but beware it gets passed different\n\ arguments.