Whilst your ASIC will allow you to access the secure part of a terminal, you must have a lawful reason to be there. If you are suggesting accessing any of the major airports you will also require an access card.
So even if you worked for virgin and had an access card for Sydney and an ASIC card, you could not wonder off over to an Emirates 777 to take a photo, unless you had a lawful reason to be there.
There is also a lot of other stuff you should become familiar with whilst you are an ASIC holder and as suggested, have a read of the info posted with your card or jump on the website (dotars I think ).
Hope this helps.