"Simultaneously buys and sells the same currency", do you believe that?

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?
 
Quote from jeb9999:

Buy from one dealer and sell to another one.
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.
 
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