[rules-users] Question about signalEvent method

[Daniel Miller]

Alright, I feel dumb posting this question, but I can't seem to find  
an answer anywhere.

When I use signalEvent, I know I'm passing it the event I want to  
fire, but then there is the "Object event" parameter.  What exactly  
happens if I fill this parameter?  What I'd like to do is the following:

Get a running process id, and signal an event on the process -- in my  
case "AttachAudio".  However, the AttachAudio is going to be proceeded  
by an action, which will be responsible for actually attaching my  
audio object to a running Alert in my system.

So, obviously I need to inject the audio object into my process  
instance.  Is that what the "event" parameter does on signalEvent?   
And if so, how does it know what variable to inject the object into?

If not, how can I do something like processInstance.setVariable 
("audio",audioObject);  processInstance.signalEvent 
("AttachAudio",null); ?

Thanks for your help in advance.

Dan Miller