(such as a text style change within a word processor). The GCN mechanism allows objects or processes to sign up for such notification and intercept messages sent by the system (or the application) so that you may respond to different changes on a case by case basis.</P>
<P>
The manners in which you sign up for these two types of notification differ although the functionality of the notification process is similar. The most straightforward way is to use a <CODE>
gcnList</CODE>
 field in an application's appl