type">function</span></span>
         a callback function to be called.  The proxy
object itself and the parameters from the signal as (simple lua types) will be
passed to the callback when the signal is emitted
        </li>
        <li><span class="parameter">signal_name</span>
            <span class="types"><span class="type">string</span></span>
         the name of the signal
        </li>
        <li><span class="parameter">sender_name</span>
            <span class="types"><span class="type">string<