"Who is allowed to enter the chambers?"

Only a few people other than members of parliament are allowed into the Senate or House of Representatives  chambers.

Parliamentary officers such as the Clerks, the Serjeant-at-Arms, the Usher of the Black RodHansard editors and attendants work in the chambers. Public servants and advisors sometimes sit in special seats at the end of the rows so they can give information to members of parliament. Important guests such as international dignitaries can also be invited into the chambers.

diagram to help explain Who is allowed to enter the chambers?