The Workbook Window: This is the core of the spreadsheet where data and formulas reside. The Workbook Window is divided up into “cells”. Cells are addressed by their column and row. For example, the cell in the upper most left corner is in column “A” and row “1” and is addressed as cell A1. Cells are “activated” for entering data and editing by click on the cell. The active cell will have a bold box around it and its column and row will be highlighted.