User script (custom action)
User script is a custom scripting rule triggered by the user when viewing a field during field verification or in the document editor. The script is triggered by clicking ... to the right of the field value or by pressing Ctrl+Shift+A.
You can set the custom script on the Custom Action tab of the field properties dialog box (right-click on the field and select Properties... on the shortcut menu). To add or delete fields information about which will be available in the user script, use the Add... and Delete buttons. To edit the script, use the Script Editor window which opens when you click Edit...
To make the script accessible to the Operators, select Enable Custom Action.