A CO-PRESENCE DATA RETRIEVAL SYSTEM WHICH INDICATES OBSERVERS OF DATA

摘要

A data retrieval system (12) has a data server (10), a co-presence server (2 2) and at least one awareness co-presence client. The data server (12) retrieve s at least one data object from among a plurality of data objects stored in a data repository. The co-presence server (22) opens communication (52B) and observation channels (52A) associated with at least one of the data objects. The awareness co-presence clients communicate with the co-presence server (2 2) and define an awareness state of the client. The co-presence server (22) ope ns a communication channel (52B) or an observation channel (52A) with each clie nt depending on the awareness state of each client per retrieved data object. F or observation channels, the co-presence server (22) indicates to each client which other clients have retrieved the same data object. The co-presence server (22) opens a communication channel (52B) associated with a retrieved data object to those clients which retrieved the data object and which are i n a communication type of awareness state.