is thrown by a slot call, or if the
            combiner does not dereference any slot past some given slot,
            all slots after that slot in the internal list of connected
            slots will not be invoked.</p></td>
</tr>
<tr>
<td><p><span class="term">Notes:</span></p></td>
<td>
<p>Only the slots associated with iterators that are
            actually dereferenced will be invoked. Multiple dereferences
            of the same iterator will not result in multiple slot
            invocations, b