From RSI - Robotic Systems Integration - SynqNet Systems
Motion Programming Interfaces
The eZMP ships with the MPI 03.04.09 C-language motion programming library and the MPX 02.00.01 Visual Basic.NET programming library.
MPX Software
For more complete documentation on the MPX, please see MPX Topcis, and MPX Software API Reference.
MPI Software
for more complete documentation on the MPI, please see MPI Basic Concepts, MPI Topics, and MPI Software API Reference.
Important: The MPI reference documentation is updated to match the latest release of the MPI. Please take note of the function or data type's Change History (shown below) to determine if the feature is available in the MPI release installed on your eZMP.

Information taken from Danaher Motion.