1. A device for communicating security settlement information between an investor, a broker and a custodian, comprising: first and second databases having software and hardware for storing and retrieving data according to unique identifiers; a plurality of broker delivery instructions stored on said first database according to broker identifiers; information about a plurality of investor accounts stored on said second database according to account identifiers; a broker transmitter for transmitting a broker identifier to a first database receiver; a first database transmitter for transmitting a broker delivery instruction retrieved from said first database with the received broker identifier to an investor receiver; an investor transmitter for transmitting the broker delivery instruction received from the first database transmitter, said investor transmitter also for transmitting an account identifier to a second database receiver; a second database transmitter for transmitting account information retrieved from said second database with the received account identifier; a broker receiver for allocating traded security shares according to the account information received from said second database transmitter; and a custodian receiver for initiating an exchange of funds and securities according to the broker delivery instruction received from said first database transmitter to settle the trade.