The windows Interface: Where you can set up the scene and initiate KeyVR. It can also show a mirror of what the the user sees in VR. While KeyVR is active you can control what is present in the scene and set the function of each controller - See more about the Windows interface.
The VR interface: What the user sees and can control inside KeyVR, through the HMD (Head Mounted Display) and the controllers - See more about the VR interface.