VX
API 
The VX API is a set of C functions built on top of OpenVX beginning with Version 12. They are generally higher-level than the functions originally published for OpenVX. They relieve the application developer from managing the details of undo-redo, display update, the topology table, history
operations, and so forth.
The VX API relies on the OpenVX framework for building and dynamically loading a user-supplied library (.dll) at runtime. Functions in this library may be invoked from the VX user interface directly or through a user-defined command template.
Initial HTML documentation for VX API is found in "win/openvx/text/ApiDoc.zip" on the VX CD. Unzip the file and open ApiMain.htm with your web browser. ApiMain.htm contains the links to browse the initial VX API documentation.