It depends on the software or application you are using. In Microsoft Excel, for example, the "Watch Window" option can be applied to multiple sheets at the same time. By selecting the "Watch Window" option in the "Formulas" tab and then clicking "Add Watch" you can add cells from different sheets to the same watch window. This allows you to easily monitor and compare the values of cells across different sheets. However, some other software or application may not have the same feature and may not allow the Watch Window option to be applied to multiple sheets at the same time