 type is used to record the subscription relationship between stock distributor
server and stock broker client. It can also be used to unsubscribe the stock broker clien
from the stock distributor server. <P>

<li><h4>Defining the common IDL interfaces</h4></li>

<PRE>
interface Trigger
{
  void start ();
  void stop ();
}
</PRE>

This interface is inherited by the stock distributor interface because it need to be run as
a daemon that can be started and stopped by a system administrator. <P>

<PRE>
interfac