 of <code><a class="el" href="interface_notification.html">Notification</a></code>s to trigger <code><a class="el" href="protocol_i_command-p.html">ICommand</a></code>s or to communicate with other <code>IMediators</code>. <code><a class="el" href="protocol_i_proxy-p.html">IProxy</a></code> and <code><a class="el" href="protocol_i_command-p.html">ICommand</a></code> instances communicate with each other and <code><a class="el" href="protocol_i_mediator-p.html">IMediator</a></code>s by broadcasting <code><a 