A cross trade occurs when a broker executes an order to buy and sell the same security at the same time, in which both the buyer and seller are clients of the broker.
A Cross Trade is represented by XT in the course of sales. If your order has been cross traded you will be able to view this on your confirmation contract note where it will be stated as 'Crossed Trade'.
As for the auctions. You just place orders as usual. The volume on the bid and offer sides get tallied up and the price in which the volumes balance with each other is the match price. Everyone in the auction gets that price for their order even if they entered something different.
For example you could bid 18c for TNO and someone could offer 16c for TNO but if the volume "matches" at 17c that is the price both your orders would go through.
I don't use NABtrade so not sure about your specific situation but I think most brokers allow you to participate
TNO Price at posting:
17.0¢ Sentiment: Buy Disclosure: Held
