| 摘要 |
A data retrieval system (12) has a data server (10), a co-presence server (22) and at least one awareness co-presence client. The data server (12) retrieves 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 (22) and define an awareness state of the client. The co-presence server (22) opens a communication channel (52B) or an observation channel (52A) with each client depending on the awareness state of each client per retrieved data object. For 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 in a communication type of awareness state.
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