be careful..., page-9

Gobble - your comments about false orders based on their pre-market price is quite shortsighted.

Overlapping buy and sell orders are commonplace at market open, are legitimate tools for operators to manage their order flow, and give only minor guidance to the underlying market's sentiments.

The ASX market has staggered openings (i.e. A-B 10:00:00 +/-, C-F 10:02:15 =/-, and so on.) so that operators can manage their order flow. An individual operator might have many orders for a single opening stock group, and a buy order of moderate quantity entered a few ticks above the indicative price ensures if the indicative price increases he doesn't need to tick his order to get the market opening price, allowing him to fill orders in multiple stocks at once.