Abstract: A computer system for offering property for exchange over a computer network includes a master database for storage of information pertaining to the property that is located on at least one master server which can be accessed by an exchangee, e.g. through a browser. The system further includes local agent databases which store information pertaining to property offered for exchange by a particular exchanger. An agent server accesses the master server so as to transfer information stored on an agent database to the master database. The computer system also includes an exchange management program adapted to record information relating to the stages of exchange of property between the exchanger and the exchangees, wherein the exchangees access the master server and request particular information from the master database pertaining to the property.