To Further on....after reading Alan Kohler argument against HFT. I now question whether it was coincidence and has it happened to others? I went to purchase a certain stock which had a gap in the buy side price, the gap had not been filled for many hours...so i start entering my buy order through iress, 50000 at 38c...hey haven't entered my password yet..and the gap gets filled in by someone else or something else " HOW DID YOU KNOW" talking to my pc, " I wanted to be in front"...thinking about this I recall that has happened on other stock to me before