what difference between IManipulationHandler and INavigationHandler in HoloToolkit?

I really like the Holotoolkit , but have the question as the title said:

what difference between IManipulationHandler and INavigationHandler ? it seems that they are designed to do the same thing, can any one tell me In what kind of circumstances should I use IManipulationHandler not INavigationHandler, or the opposite

is there any example I can check?

thanks

The Holo Tool Kit is a Microsoft project, you might have better luck asking on the git hub or MS forums. I’m unfamiliar with the Tool Kit, but it sounds like they are 2 separate interaction types of the gesture recognizer