@INTEREST is written completely in C and C++ and provides extremely fast calculations. It includes Excel add-in functions (XLL files), customizable Excel templates, and documentation. When installed, @INTEREST adds functions to Excel that are used like the built-in worksheet functions, so you can customize the @INTEREST templates or create new ones. For a Windows installation, @INTEREST requires the following minimum machine specification: 300 Mz Pentium 64 Mb RAM 30 Mb free disk space Please note that FEA products perform a very large number of calculations and that a faster processor will improve performance in most cases. Disk space requirements will vary with the amount of data used and the number of spreadsheet templates that the user creates. FEA products are also supported on Unix and Unix-like platforms. Requirements vary with the exact operating system in use. Please contact our support department (fea_support@fea.com) for more details. View the @INTEREST product profile.