code: def _key_changed(self, client, cnxn_id, entry, data=None):
          
          key = self._fix_key(entry.key)[len(self.GCONF_DIR):]
          value = self._get_value(entry.value, self.DEFAULTS[key])
  
          self.emit('conf-changed', key, value)
docs: Callback when a gconf key changes