In our environment, support for collaborative work is provided by a ScWfMS, a VCS and a collaboration bus (CBus),which is a collaborative infrastructure for integrating the execution of engineering applications with our VRV component . This allows users to Collaboratively view their results and optionally create virtual annotations,sharing knowledge about the engineering artifacts mation that users want to add to their projects to enrich the content or just for documentation,having a private or public (shared) scope. Annotations can be associated to any artifact manipulated during a collaborative visualization session,which usually happens at the end of the execution of any sequence of engineering simulations (Figures 6-9)