The Edit window is used to add, change and delete individual records. In most cases the Edit window is associated with a List window. The Edit window may have line items and sub-sections like the Inventory Master Edit window: Or, it can simply have fields from the corresponding table:

Of course there is a calculator on Windows. Some keyboards even have a key that will start it up. But sometimes you need to do math on a specific field. It would be nice if the current value of the field loaded into a calculator – and when you finished the math –  the result woul