For example, make sure the 722 is in single mode, then to record 3 shows that are on right now, press Guide button, scroll up and down and select a show on satellite (any blue title), press Record button. Now select a second show on satellite (any blue title), press Record. Then select any show on antenna (yellow title), press Record.
okay, I was just trying to make sure my simple example would work without any complications. And I forgot the last step: press the DVR button twice and witness the 3 red balls for the 3 recording shows simultaneously.