The resetPose() method of the VRDisplay interface resets the pose for the VRDisplay, treating its current VRPose.position and VRPose.orientation as the "origin/zero" values.
The hardwareUnitId read-only property of the VRDevice interface returns the distinct hardware ID for the overall hardware unit that this VRDevice is a part of. All devices that are part of the same physical piece of hardware will have the same hardwareUnitId.