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<p><font size="4">For the record, I found the answer to my question
:</font></p>
<p><font size="4"><font face="monospace">Object>>addDependent:
anObserver<br>
"Make the given object one of the receiver's observers
(dependents).<br>
<br>
Receivers of this message, i.e. objects being observed,
are usually called Models.<br>
Observing can also be set up sending one of the
#<a class="moz-txt-link-freetext" href="when:send:to">when:send:to</a>: or #addDependent: messages.<br>
Models will send themselves #changed:, #changed or one of
the #triggerEvent* messages to notify possible observers.<br>
<br>
<b> If appropriate, it is best to make Models inherit from
ActiveModel, for performance reasons."</b></font><br>
<br>
</font></p>
<pre class="moz-signature" cols="72">--
GNU Dr. Geo
<a class="moz-txt-link-freetext" href="http://gnu.org/s/dr-geo/">http://gnu.org/s/dr-geo/</a>
<a class="moz-txt-link-freetext" href="http://gnu-drgeo.blogspot.com/">http://gnu-drgeo.blogspot.com/</a></pre>
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