Which bank are you talking about ? I'd love to have a bank account like that for nonstandard transactions. As far as I can tell, this is only possible paid.
Pretty sure it was bank of queensland but this was quite some time ago.
If you go to http://www.boq.com.au/ and go through to their log in screen this is why there are three text boxes instead of the usual two (a clunky solution to needing different login details from different people).
Certainly not CBA, but allegedly Westpac and NAB both allow "view only" access for third parties. (I cannot confirm this, but have seen it mentioned on the CBA's uservoice request for this feature[1])
