The software is written for Windows 95/98. System resource requirements are based upon the data the user will be working with. We suggest a minimum of 32Mb of RAM (more memory improves performance) and 150Mb of available hard-disk space for the basic system. Data products range from a few megabytes to several gigabytes in size and are available on the web and CD-ROM. At present, large data products are only available on CD-ROM.