In Microsoft Access version 2.0, Wizards often use values stored inside tables to change their behavior or appearance. In this example, the Subform Wizard stores the value of the color of its form in a table inside its own library database. The Add-in Manager provides users a convenient way to customize their Add-ins by changing values in those tables. When users select your Add-in and clicks the Customize...button, the Add-in Manager launches a function that you specify to customize your add-in. You can provide users with whatever interface you want.