A Software Development Kit (SDK) for Nintex Workflow 2007 for you to extend Nintex Workflow to suit your needs.
The SDK is intended for developers and includes API documentation as well as technical how to's and code examples.
NOTE - The SDK assumes Nintex Workflow 2007 build 10825 or higher. You may find some API's are not available in earlier builds. The SDK includes the following information:
Updated 17th of March 2010.