1. A method of teleconferencing among a plurality of user sites, comprising the steps of: storing a common set of data objects in a plurality of digital computers, each of the digital computers located at a respective user site and having a memory for data object storage and a monitor for data object display, wherein the storing step occurs prior to a teleconference among the user sites; interconnecting the plurality of user sites into the teleconference via a network; at an individual user site, selecting a data object from the common set of data objects and transmitting an audible signal to the other user sites via the network to indicate the selected data object; and at each of the other user sites, receiving and decoding the audible signal and displaying the selected data object on the respective digital computer monitor in response to the decoded audible signal.