I need to record my church's service on Garageband and at the same time project a Powerpoint of our announcements onto a screen. Can this be done so that I can see a split screen of both programs running but without the congregation seeing the garageband program. I hope this makes sense! Right now we use a computer to run the powerpoint that projects on to a screen and another computer to run garageband to record the audio of the service. Our goal is to have both these tasks run off our mac laptop so we can have 1 person rather than 2 running the a/v.