ActionList or TActionList maintains a list of actions that your application can take in response to something a user does, such as components and controls (e.g. menu items and buttons).
Use Action lists to centralize the response to user commands (actions). Action list components maintain a list of actions that are available to the client controls in an application. This lets you share common code for performing actions (for example, when a toolbar button and menu item do the same thing), as well as providing a single, centralized way to enable and disable actions depending on the state of your application.