More than just a calculator! Add 'em Up can perform math calculations on data that resides on the Windows Clipboard. Although Add 'em Up can morph into a standard Desktop calculator with one press of the F9 key, it's uniqueness is in its ability to perform math calculations on data that resides on the Windows Clipboard. Let's say you are working in a spreadsheet, Microsoft's Excel, for instance. You have rows upon rows and columns upon columns of data, and you want to perform a math operation on just a select few cells in your spreadsheet. Simply select the cells you want to perform math operations on, then use the "Edit > Copy" (or CTRL+C) function in Excel, which will copy the cells to the Windows Clipboard. Once your selected data is on the Clipboard, then go to the Add 'em Up window (which can stay topmost and visible at all times) and click the "Calculator Clipboard" button. The data that had been copied to the Windows Clipboard is automatically pasted into the Add 'em Up number list. When the number list has been populated with numbers, you can then click on any row or column and perform math calculations on them. Numbers are automatically added, subtracted, multiplied or divided from each other. Handy for quick mathematical operations on groups of numbers.