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This paper describes a user-interface system developed to support group interactions for same-time/different-place cooperative applications. We address three fundamental aspects of these kind of systems: information sharing, coordination and multiuser-interface. The proposed approach defines four types of objects. Contents store application data. Containers are dedicated to organise and structure application data. Connections manage group coordination. And, finally, Monitors are concerned with users awareness of cooperative activities. One important characteristic of the approach is that it identifies and maps into the above objects two basic properties of group interaction support: visibility (public/private information) and durability (durable/transient information). The system eases the design of complex group interaction processes because it defines simple actions that allow programmers and users to define and combine object properties. An example of system usage is given for an application that supports brainstorming activities.