After you install the add-in, you will have new Category in Excel's Native "Insert Function" dialog box. Most Custom Functions are grouped together. That is, Function preceded with L_ means it's a Lookup Function. D_ means Date Function, B_ means Boolean (TRUE/FALSE) Function, C_ means Color Function, S_ means String (Text) Function. PRE200* means the lowest version the custom function will work on. http://www.ozgrid.com/excel-add-ins/free-excel-addin.htm