def open(subkey, desired = KEY_READ, opt = REG_OPTION_RESERVED, &blk)
      self.class.open(self, subkey, desired, opt, &blk)
    end
def open(subkey, desired = KEY_READ, opt = REG_OPTION_RESERVED, &blk)
      self.class.open(self, subkey, desired, opt, &blk)
    end
open/close