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An Addon is a plugin technology that allows the functionality of applications like CorelDRAW, Corel DESIGNER and Corel PHOTO-PAINT to be extended. A custom Addon could enhance the application to have a new tool in the Toolbox or introduce a new user interface (e.g. menu, toolbar, docker, dialog or custom control). The custom code that supports the new tool or UI can interact with the host application using VSTA.
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