SHandles are a set of classes that provides alternative handles for HOOPS Communicator based applications that work similar to handles found in Blender/Unity/etc. In addition the library provides a few other features not found in the standard HOOPS Communicator handles.
You can learn more here:
New style for rotate handles with trackball rotate:
Scale Handle Support
Place handle on curves/faces of model
Snapping Support for Translation and Rotation
Handles optionally adjust to part rotation
Undo/Redo Support