asterisk users - May 2007 - FW: Play a file on a channel from the Manager API

Anyone have any ideas how this might work?  Any experience doing this?
>> Is there any way to play a file on a channel from the Manager API 
>> (other than from Originate)?
>This question was asked by someone else on the ast-dev list and the
only >advice given was that Redirect was the solution.  I find myself
with the >same problem now but I don't understand the response.
>The situation: I need to play a file from the Asterisk Manager on a
channel >that is currently in a call.  I don't want to break them out of
the call to >play the message and I only want one specific channel to
hear the message.  >In effect I want to ChanSpy the channel but to play
a message instead of >speak to the person on the channel. 
>How does Redirect provide a solution?  
>Thanks again,
>George