Hi Rabbie
As the recognised professional association for those working in ICT in Australia, the mission of the is to advance professional excellence in ICT. Like many like bodies in other parts of the world, we have non Australian to join the ACS and also Australians living outside to retain their ACS membership under a separate fee structure. Details at Australian Computer Society - Membership Fees.
Guideline for membership of the ACS can be retrieved at Australian Computer Society - Membership Levels and Entry Requirements Non-resident who wants to join the ACS can visit "How to Join" page at Australian Computer Society - Join the Australian Computer Society
Under the agreement between the ACS and the Department of Immigration and Citizenship (DIAC) of Australia, those seeking to migrate to Australia as an IT Professional must complete an assessment through the ACS prior to lodging a migration application. This is a key reason why we have a section for non-resident in our homepage.
Let us know if you've other questions, please.
Simon Kwan
General Manager, Corporate Affair & Policy
Australian Computer Society