An example would be Cardno Ltd which has:
- CDD.AX - http://investing.businessweek.com/research/stocks/snapshot/snapshot.asp?ticker=CDD:AU
- CDDN.AX - http://investing.businessweek.com/research/stocks/snapshot/snapshot.asp?ticker=CDDN
I can see that the CDDN has no updated info... does that mean its not active? But will there ever be a time when a company has 2 or more active listings on the same exchange? If yes, what would be the difference?
Please note that I do not have a full/official background for trading/financial markets.