function _writeln($line)
    {
        /* Add this line to our output buffer. */
        $this->_buffer[] = $line;

        /* Buffer the output until this page's headers have been sent. */
        if (!headers_sent()) {
            return;
        }

        /* If we haven't already opened the output window, do so now. */
        if (!$this->_opened && !$this->open()) {
            return;
        }

        /* Drain the buffer to the output window. */
        $this->_drainBuffer();
    }