Abstract: Data transaction processing requests are received from user terminals over one or more data communications networks. Pending data transaction processing requests are stored in a memory queue. Each pending data transaction processing request has associated attributes and an associated queue number. A higher queue number associated with a pending data transaction processing request indicates a lower data transaction processing priority than a lower queue number associated with a pending data transaction processing request. Data message information is transmitted to user terminals that includes an identifier and a current status for pending data transaction processing requests stored in queue. A current data transaction processing request is received having an identifier for selecting a first pending data transaction processing request that has an associated queue number of two or higher over a lower queue number associated with a second pending data transaction processing request.

Abstract: Electronic messages regarding a current order status of an order book of an electronic exchange system are transmitted to users including information concerning identities of parties having placed orders stored in the order book. The current order status is associated with a queue of orders stored in the order book. Each stored order has associated properties and an associated queue number. A higher queue number indicates a lower trading priority than a lower queue number. An electronic order message is received to trade selecting an order stored in the order book having a queue number of two or higher than over a lower queue number order stored in the order book. Both the selected order and the lower queue number order have properties matching both the selected order and the lower queue number order. The received message is identified as including information that selects the order stored in the order book having a queue number of two or higher.

Abstract: A trading system for trading financial instruments, comprising a matching unit for matching received orders having corresponding requirements and an order book for storing unmatched orders is described. The trading system further comprises a decision unit/reinsertion unit connected to the order book for determining when matched orders are to be removed/reinserted based on confirmation of acceptance of the trade received from a user terminal.

Abstract: An anonymous trading system that enables users to select counterparty requirements. Each user has an interface to add trader preconditions regarding available counterparties. Those trader preconditions include an expression of the user's willingness to trade with selected counterparties. The added trader preconditions are collected from the users and combined into a trader matrix. The trader matrix is used to determine matching criteria for orders sent in by users. An anonymous trading system and a terminal for sending orders to an anonymous trading system are also provided.

Abstract: A method of matching orders on an electronic trading system is disclosed. The method includes the steps of broadcasting information regarding current order status of an order book of the electronic trading system, said order status comprising a queue of orders; receiving an order to trade selecting an order in the order book having queue number two or higher, said received order having properties matching the selected order; and matching the received order with the selected order.

Abstract: A trading system for trading financial instruments, comprising a matching unit for matching received orders having corresponding requirements and an order book for storing unmatched orders is described. The trading system further comprises a decision unit/reinsertion unit connected to the order book for determining when matched orders are to be removed/reinserted based on confirmation of acceptance of the trade received from a user terminal.

Abstract: A method for use in an anonymous trading system, enabling users to select counterparty requirements is provided, said method comprising, providing each user with an interface via which each user may add trader preconditions regarding available counterparties, which trader preconditions at least comprises an expression of the user's willingness to trade with selected counterparties; collecting all added trader preconditions from the users; combine all trader preconditions into a trader matrix; and using the trader matrix for determining matching criteria for orders sent in by users. An anonymous trading system and a terminal for sending orders to an anonymous trading system are also provided.