August 14, 2012 
We believe Knight accidentally released the test software they used to verify that their market making software functioned properly, into NYSE’s live system.
In the safety of Knight’s test laboratory, this test software (we’ll call it, the Tester) sends patterns of buy and sell orders to its new Retail Liquidity Provider (RLP) Market Making software, and the resulting mock executions are recorded. This is how they could ensure their new market making software worked properly before deploying to the NYSE live system.
(Full Story: Knight accidentally released the test software to the NYSE?)
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