[AWS] Starting a Task in a Callback and Immediately Returning

[Graham Stark]

Hi,

Apologies if this is obvious, but I can't figure it out. Also apologies
for posting this both here and in the comp.lang.ada group.
 
Using AWS, I want a user to be able to submit a job via a web page that
might run for 10-20 minutes, and have the server duly start it but
respond immediately with a reply like "your job has started" (as a web
page). 
 
So, something like: 
 
function Web_Callback (request : in AWS.Status.Data) return 
 AWS.Response.Data 
 begin 
   Start_Long_Job( ... ); 
   return "your job has just started"; 
 end Web_Callback; 
 
Can I do this using Ada's tasking facilities? So far as I understand
them, all the Tasking examples I've looked at would have the return
executed only after Start_Long_Job has completed. Is that right? But,
obviously, you can't wait 10 minutes to reply to a web request. 
 
Or is there some other way of doing this? 
 
Graham