This application works exclusively with CNC hardware whose development is explained in this web page:
https://sites.google.com/site/controlofmachines/control-maquina-4-ejes

The system supports "manual" movement of the 4 axes.
In addition, 6 complex movements are offered, which correspond to the most common manufacturing processes: manufacture gears with a V-shaped cutter, manufacture gears with a milling cutter with involute profile, manufacture circumferences and circles, grooving and facing, as well as drilling.
You can also move any point like an indexed rotary table (rotary table indexer).