A method for controlling a touch control device includes defining a first area and a second area on a touchpad, detecting whether a touched position on the touchpad that is touched by an operating object falls in the first area or the second area, and calculating the corresponding on-screen coordinates of the operating object with different sets of ratios depending on the touched position. The spectral properties of the FSK watermark signal facilitate its detection, even in applications where the watermarked signal is corrupted. The properties of these materials are chosen to optimize the interfaces on each side of the graded layer. The shape of the risers shown is flat with a textured top surface to promote traction between the pot and the riser. The non-replicating vector may be formulated with a pharmaceutically-acceptable carrier for in vivo administration to the host. The heatingcooling unit heats the optical device using self-generated heat or cools the optical device via the soaking unit.