It's called 'high-frequency trading' (HFT) or 'algorithmic trading', Wabbit. It's conducted by computers and is basically legal attempt at price (market) manipulation in the view of many (including me). If you were to do trades like that manually, especially at the start or end of the day (during match-ups) ASIC would come down on you like a tonne of bricks, accusing you of attempting to manipulate the stock price.
I personally have a huge issue with this sort of trading, and also with raising's like the one recently being only open to the 'special privileged few' (708's). Frankly it's NO DIFFERENT from that crap that allegedly went on inside ANZ, and it's WRONG and needs to be banned too.
1. Trading by computers in this manner BANNED.
2. 'Special investors' (708's) given only part of a raising, with the balance 15% minimum as rights issues to existing shareholders AT THE SAME PRICE!
Just my daily gripes... if you're interested.
