Abstract: A procedure is enabled to respond to an order en route to a marketplace so that the procedure can determine whether to generate a spawned order, and the spawned order is sent to a destination for execution essentially contemporaneously with the sending of the en route order to the marketplace. The spawned order can be sent to the same marketplace or a different marketplace than the en route order is sent to. The spawned orders provide additional liquidity.

Abstract: An order en route to a marketplace is delayed so that a procedure can determine whether to generate a spawned order, and the spawned order is sent to a destination for execution essentially contemporaneously with the sending of the en route order to the marketplace. The spawned order can be sent to the same marketplace or a different marketplace than the en route order is sent to. The spawned order provides additional liquidity.

Abstract: An order en route to a marketplace is delayed so that a procedure can determine whether to generate a spawned order, and the spawned order is sent to a destination for execution essentially contemporaneously with the sending of the en route order to the marketplace. The spawned order can be sent to the same marketplace or a different marketplace than the en route order is sent to. The spawned order provides additional liquidity.

Abstract: A procedure is a template that specifies trigger conditions and what to do when the trigger conditions occur, or do not occur within a specified time. Generally, a procedure corresponds to an order handling strategy used by a trader. A menu of standard procedures exist, and custom procedures are accommodated after being qualified for use in the present system. An interest represents an intent to trade. In contrast, an order is a definite commitment to buy or sell a certain amount. Generally, an institution or professional trader will know that they wish to trade when conditions are right, but will not be quite ready to submit an order. The institution or trader thus represents untapped market liquidity. By representing such liquidity as interests, the liquidity can be more efficient coupled to markets.

Abstract: A method for detecting a tracking error in a process of tracking a groove track on a recording medium includes the steps of: irradiating a first light spot onto a groove track on a recording medium as a focused light beam for carrying out recording, reproducing, or erasing of information on the groove track of the recording medium; and irradiating a second and a third light spots onto an area around the groove track on the recording medium as focused light beams simultaneously with the irradiation of the first light spot, the second and third light spots are irradiated onto an area around the groove track on one side of the first light spot in a manner such that each of the second and third light spots covers both an inside and outside of the groove track.