1. A system for displaying securities market transaction information received from a securities exchange market data system comprising: an exchange server operatively coupled to the securities exchange market data system and adapted to receive therefrom transaction information and order book information relating to at least one security, said transaction information including price and volume of at least one trade in said security; and a trader workstation operatively coupled to said exchange server; said exchange server being further adapted to transmit to said trader workstation a selectable portion of said transaction information and order book information relating to said at least one security; said trader workstation being adapted to display for each trade of a user-selected security within a user-selected range of trades represented in said transaction information an indicium representing said price of such trade; said trader workstation being adapted to determine responsive to said transaction information and said order book information whether said trade was seller-initiated or buyer-initiated, and responsive to said determination to control appearance of said indicia to distinguish between buyer-initiated and seller-initiated trades; and said trader workstation being adapted to display at least a subset of said order book information relating to said user-selected security adjacent said indicia.