wide the pool of knowledge was? >> this was an extremely well defended fraud. i describe in the book the elaborate precautions that he took to hide his fraud from even those closest and nearest to him. >> for instance? >> for example, he had a computer program that allowed him to set up a computer screen on his desk that made you think that you were looking right into wall street's central clearinghouse. a third party. >> sure. >> there are all of your stocks there on the screen. safe and sound. it was all a fraud. he could be at the computer appearing to be making trades for you in europe and it's actually a guy in a room down the hall. they held on to stationary to back date all documents and stick into the files if they thought regulators would expect to find them there. he applied technology in the same way he applied it to stock