The Actions panel displays the action sets available for the bundle. Depending on the bundle type, the possible action sets are Distribute, Install, Launch, Repair, Uninstall, Terminate, and Preboot. For example, if you select a Windows bundle, all five actions sets are available. If you select an Preboot bundle, Preboot is the only available action set.
You can add an action to any of the available action sets. When you do so, that action is performed whenever the action set is applicable. For example, when you add an action to the Install action set, that action is performed whenever the bundle is installed.