typedef enum {
	IN_SESSION,
	NOT_IN_SESSION,
	QUICK_REFOCUS
} SessionState;

class NIState {
public:
	static SessionState gSessionState;
	static void XN_CALLBACK_TYPE sessionStarting(const XnPoint3D &ptPosition, void *userCxt);
	static void XN_CALLBACK_TYPE sessionEnding(void *userCxt);
	static void XN_CALLBACK_TYPE focusProgress(const XnChar *strFocus, const XnPoint3D &ptPosition,
											   XnFloat fProgress, void *userCxt);
};