Collaborative systems should allow multiple usera not only to interact with shared objects but also communicate and coordinate their actions. Collaborative may be seen as the combination of communication, coordination and cooperation [Eillis et al. 1991] communication is related to the exchange of messages and information among people . coordination is related to the management of people, the interdependencise among their activities and the resources used . Coordination is the production of common artifacts taking place in a shared space through the operations available to the group.