On Tue, 25 Mar 1997 13:42:58 +1030 (CST), 
Stephen Baxter <steve§senet.com.au> asked:
 
> What or who are the ACA ?
[...]
> The only reference I seem to be able to find is the Australian Consumer
> Association - ...

My guess is something like "Australian Communications Authority", but I
agree that the ACA seems to have a much earlier claim to this acronym.

Cheers,  Ian S.

P.S.  The other day I mentioned "International Postal Union", but people
familiar with such things will know I meant "Universal Postal Union".
(As it was named by the UN in a moment of unprecedented modesty.  :^)