http://www.csm.ornl.gov/cs/cumulvs.html%|%CUMULVS%|% is a software infrastructure for the development of collaborative environments. It supports interactive visualization and remote computational steering of distributed applications by multiple collaborators, and provides a mechanism for constructing fault-tolerant, migrating applications in heterogeneous distributed computing environments.

CUMULVS contains a library for scientific applications that provides computational steering control, as well as visual feedback that a scientist can intuitively analyze. The library consists of approximately 20,000 lines of C code.  Tcl binding: [http://www.ncsa.illinois.edu/People/semeraro/viewers.html]. The CUMULVS distribution includes a standard Tcl/Tk slicer and a sample custom Tcl/Tk viewer for a particle-based
simulation. 

[http://www.csm.ornl.gov/cs/seismic_small2.gif]

[http://www.csm.ornl.gov/cs/pvmAVS.gif]

CUMULVS provides:

   *  Collaborative On-Line Visualization of Remote Simulations through Multiple Viewers Connecting to a Running Application.
   *  Coordinated Computational Steering Among Several Collaborators.
   *  Automatic Recovery of the Virtual Environment to Host or Network Failures.
   *  Fault-Tolerance of Distributed Simulations through Heterogeneous Task Migration and User-Directed Checkpointing.
   *  A Monitoring System for High-Performance Scientific Simulations.
   *  Dynamic Viewer Attachment / Detachment.
   *  Message-passing over wide-area ATM networks between multiple MPP and SMP systems.
   *  Secure and authenticated data transfer. 

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