Abstract: A method for controlling a light is provided. The method is suitable for a computer system. The method includes interrupting an original service of the light and obtaining the authority to control the light. The method also includes controlling the operation of the light according to a current status of the computer system.

Abstract: An identification marker (17) is described for use in permanently identifying an individual histology sample (21), the marker including columnar indicia (18) mounted on a base (19) having a location flange (20). A specially adapted cassette having a slot (16) to receive the identification marker is described together with apparatus and method for moulding the indicia in a protein such as agar agar. The use of the identification marker is described firstly mounted in the cassette (11) during treatment of the sample (21) and later mounted beneath the cassette (11) in the slot (16) for wax embedding of the sample and identification marker. The marker (17) is sectioned simultaneously with the tissue sample (21) by means of a microtome (31), each section taken being identified by a section through the identification marker embedded alongside the sample.