Networks of workstations are poised to become the primary computing in
frastructure for science and engineering. NOWs may dramatically improv
e virtual memory and file system performance; achieve cheap, highly av
ailable, and scalable file storage; and provide multiple CPUs for para
llel computing. Hurdles that remain include efficient communication ha
rdware and software, global coordination of multiple workstation opera
ting systems, and enterprise-scale network file systems. Our 100-node
NOW prototype aims to demonstrate practical solutions to these challen
ges.