An addon is a plugin technology that allows the functionality of applications such as CorelDRAW, Corel DESIGNER and Corel PHOTO-PAINT to be extended. A custom addon can add a new tool to the application toolbox or introduce a new UI (user interface) element such as a menu, toolbar, docker, dialog box, or custom control. The custom code that supports the new tool or UI element can interact with the host application using VSTA.
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