The Harvest cache runs under several operating systems, including SunOS, Solaris, DEC OSF-1, HP/UX, SGI, Linux, and IBM AIX. Binary and source distributions of the cache are available from https://excalibur.usc.edu/. The test code and the list of URLs employed in the performance evaluation presented here are available from https://excalibur.usc.edu/experiments. General information about the Harvest system, including the cache user's manual, is available from https://harvest.cs.colorado.edu/