To increase your efficiency, Excel includes a variety of add-ins ”programs that are included with Excel but not essential to its functionality. Some of these supplemental programs are useful to almost anyone using Excel. Others, such as the Analysis ToolPak, add customized features, functions, or commands for use in financial, statistical, engineering or other highly specialized fields. Before you can use an Excel add-in, you need to load it first. The first time you load an add-in, you may need to install it using the Office 2003 CD. When you load an add-in, the feature may also add a command to a menu. You can load one or more add-ins. If you no longer need an add-in, you should unload it to save memory and reduce the number of commands on the Tools or Data menu. When you unload an add-in, you also need to restart Excel to remove an add-in command from a menu.
Load or Unload Add-Ins