A system for exchanging various forms of information between computer-executable agents. A computing device is configured to determine semantic data associated with each data object (DO) of a plurality of DOs. Each DO is associated with a location, and the semantic data describes the content of the associated DO. The computing device receives, from a first user computing device, a request for DO information and, in response to the request, provides DO information including the locations and the semantic data associated with the retrieved DOs to the user computing device by (a) transmitting the locations and the semantic data to the first user computing device, and/or (b) instructing the first user computing device to request the DO information from a second user computing device to which the locations and the semantic data were previously transmitted.