I know it can be done because we do it. I just don't know the details. But in QlikView Enterprise Management Console, one of the trigger options is "On an external event". The external program, something in your data warehouse in this case, has to send the event, which I think is just the name of the task, to the server somehow. Sorry I can't be of more help on the specifics - I haven't set up any of the sending of events, just the receiving of events.