 Cornell's <a href="http://www.cs.cornell.edu/Info/People/rvr/papers/arch/arch.html"> Horus </a> effort has developed a programming environment for reliable distributed computing.  During the last year, Horus was used to demonstrate groupware and fault-tolerance over high performance networks, and was found to offer higher performance than other similar systems.  Novel features of Horus are its flexible software architecture, in which applications  pay only for features that they use, and support for virtually synchronous process groups, a technology that we developed in our prior work on the <a href="http://www.cs.cornell.edu/Info/Projects/ISIS/ISIS.html"> Isis </a> Toolkit, which has become a significant commercial success.  Horus also offers a fault-tolerant <a href="http://cs-tr.cs.cornell.edu/TR/CORNELLCS:TR93-1354"> security and privacy </a> technology, which we view as an important research advance. <p>
