# Extensions An  extension is an embedded script in the execution flow of the Model. An extension enriches a Model with functionality that is not included by default in Invantive Control for Excel. An example of an extension to automatically add data to the worksheet using a button.  The meaning of the input fields is: | Code | Enter a unique name for the extension. | | ---- | ---- | | Load order | Enter a number for the load order of the extension in Invantive Control for Excel. | | Active | This field indicates whether the extension is active or not. | | Language | Specify the programming language of the extension. | | Description | Provide a description of the extension. | | File location | Specify a file location for the extension. The 'File location' or 'Definition' field must be filled with the location of the extension or the program code, respectively. | | Definition | Provide the program code of the extension. The 'File location' or 'Definition' field must be filled with the location of the extension or the program code, respectively. | | Comments | Provide comments on the extension. |