Really there are three layers though you can mush the first two together.
'Frontline' - seen as the show that goes to air. You know, polished Camera, with Mike Moore as the anchorman.
"Frontline" - this is the behind the scenes one. Where it is seen by handheld character. In the office style. You see Brian, Brooke, Emma ect ect making stories
Frontline - This is Rob Sitch's text as a whole.
I hope that makes sense.