The PerpetualWorkbook system is a modular set of loosely coupled utilities, add-ins and services designed to assist and enhance the use of Excel for budgeting, forecasting and financial planning. What does loosely coupled mean and why is it important?

It means you can use any of the modules or services independently of the others. However, used together they provide powerful computing and management functions to take your Excel spreadsheet system far beyond your current levels. PerpetualWorkbook solves the problems associated with shared workbook techniques and provides secure collaborative updating for the entire network.