Watch cells and their formulas (formula: A sequence of values, cell references, names, functions, or operators in a cell that together produce a new value. A formula always begins with an equal sign (=).) on the Watch Window
toolbar (toolbar: A bar with buttons and options that you use to carry out commands. To display a toolbar, click Customize on the Tools menu, and then click the Toolbars tab.), even when the cells are out of view.

Watch Window toolbar
- Select the cells you want to watch.
To select all cells on a worksheet with formulas, click Go To on the Edit menu, click Special, and then click Formulas.
- On the Tools menu, point to Formula Auditing menu, and then click Show Watch Window.
- Click Add Watch
.
- Click Add.
- Move the Watch Window toolbar to the top, bottom, left, or right side of the window.
- To change the width of a column, drag the boundary on the right side of the column heading.
- To display the cell that an entry in Watch Window toolbar refers to, double-click the entry.
Note Cells that have links (external reference: A reference to a cell or range on a sheet in another Excel workbook, or a reference to a defined name in another workbook.) to other workbooks are displayed in the Watch Window toolbar only when the other workbook is open.