- ured in bit-meter-per-second, or bmps. The world record for the current TCP is 10 peta (1 followed by 16 zeros) bmps, using a nonstandard packet size. However, the Caltech/SLAC experiment transferred 21 terabytes over six hours between Baltimore and Sunnyvale using standard packet size, achiev- ing 34 peta bmps. Moreover, data were transferred over shared research networks in the presence of background traffic, suggesting that FAST can be backward compatible with the current protocol. The FAST team has started to work with various groups around the world to explore testing and deployment of FAST TCP in communities that urgently need multi-Gbps networking. The demonstrations used a 10-Gbps link donated by Level(3) between StarLight (Chicago) and Sunnyvale, as well as the DataTAG 2.5-Gbps link between StarLight and CERN, the Abilene backbone of Internet2, and the TeraGrid facility. The network routers and switches at StarLight and CERN were used together with a GSR 12406 router loaned by Cisco at Sunnyvale, additional Cisco modules loaned at StarLight, and sets of dual Pentium 4 servers each with dual Gigabit Ethernet connections at StarLight, Sunnyvale, CERN, and the SC2002 show floor provided by Caltech, SLAC, and CERN. The project is funded by the National Science Foundation, the Department of Energy, the European Commission, and the Caltech Lee Center for Advanced Networking. One of the drivers of these developments has been the HENP community, whose explorations at the high-energy frontier are breaking new ground in our understanding of the fundamental interactions, structures, and symmetries that govern the nature of matter and space-time in our universe. The largest HENP projects each encompasses 2,000 physicists from 150 universities and laboratories in more than 30 countries. Rapid and reliable data transport, at speeds of 1 to 10 Gbps and 100 Gbps in the future, is key to enabling global collaborations in physics and other fields. The ability to analyze and share many terabyte-scale data collections, ac