Asynchronously Submitted Job - Where does it reside until it finishes?

We know how to email attachments using a wrapper.  We submit the wrapper UBE and it kicks off a child UBE (we get the job number form the launch), which we test for in the F986110 under the server map.  We loop until the child UBE is finished to send the email attachment.

Here is my question:

An asynchronously submitted job does not show up in the F986110 under the server map until it is finished, so how does our loop know when it is finished.  I see the wrapper job running, but I don't see the child job.  Where is it?   The process works, but how does it work?