Professional :: Using The "on Mouse Click" Snippet?

using the "on mouse click" snippet in cs5 gives the following code as example code for something which can happen on click trace("Mouse clicked");
 
The notes say that this adds "mouse clicked" to the output pannel
 
indeed while previewing the file in flash mode clicking on the object adds this line to the output pannel each time.but while previewing in other modes such as html it does not
 
so what  exactly is the output pannel does it store data which can later be called upon or does it have no use?