Providing data to an application running on a segmented virtual machine is disclosed. The main pipe passes through the clamping device. The value of the time code register may be incremented at regular intervals based on a clock of the image signal processing system. High doses of ultraviolet light are restricted to diseased tissue areas The skin can be cooled prior to andor during exposure to UV light to minimize tissue damage resulting from exposure to the UV light. A first screen is set for the signal of the rear wall echo, starting at a moment in time t1S=tE+tMin\u2212tSA and ending at a moment in time t1T=tE+tT+tSE, whereby tSA and tSE are additional small security measures. Advantageously according to embodiments of the invention, the error code incorporated in the original sequence belongs to a non Boolean group.