It says: "They are even thinking about building a black box for doing interbank currency trading electronically. The idea is to trade all the world's currencies in a rapid-fire system that Simultaneously buys and sells the same currency" on The Predictors (by Thomas Bass; p.305), do you believe that? How they do that?
Exactly. This worked well once upon a time when computers were something elaborate and difficult to understand. Now interbank traders platforms automatically look for the bid/ask.