1. A computer system comprising: an interchange party computer system configured with a plurality of different units of resources for interchange of data and information between a plurality of categories of participating parties, each participating party having a selected role or service in a real estate transaction that comprises a real estate purchase or finance transaction, and the data and information being related to a transaction, the interchange party computer system being couplable over a computer network with a plurality of computer systems, each corresponding to a different category of the participating parties, the interchange party computer system being configured with executable code to control the interchange of the data and information via the networked computer systems; a plurality of resource units stored on the computer system and comprising computer code and/or data in the nature of forms or templates related to the roles or services of a participating party; and executable code stored on the computer system for selectively allocating units of the resources to participating parties, who are then authorized by the interchange party computer system to control their respective allocated forms or templates and modify them according to built-in parameters according to the roles or services of a participating party.