A method and an apparatus which controls write power of an optical driver by optimizing the number of channels used to drive a laser diode in a write mode while stabilizing the level of a write power voltage at an early stage of the write mode. A cnt parameter may be used to indicate a total number of elements to be transferred to or from memory, and an rcnt parameter may be used to indicate a maximum number of vector elements that may be transferred to or from a single register within a register file. The member also includes a receiving aperture in a first end of the member for receiving an end of an adjacent member. This interface allows a high speed and high fidelity connection between the test head and the devices on the DUTs for frequencies in excess of 50 MHz. Embodiments include formation of various rope dressing and their use in conjunction with reduced pressure therapy. Accordingly, even when a prism is not formed, alight transmitting through the lens is largely refracted and an interior section is hard to be visible.