A local cleaning system which uses a charged air shower unit for forming a shield curtain by means of an ion wind, and a local exhaust device for exhausting the air containing dirt and dust settled down on the floor by the ion wind to construct a clean shielded space with no need for a dedicated partition wall. A secure server includes a modified operating system that just allows a kernel application to access a secure hard drive of the secure server. The received light is mixed with reference laser light and using photonic Doppler velocimetry, a continuous time record of the surface movement is obtained. A tool andor material may be delivered to the tissue drawn into the tissue-receiving space.