To optionally forming a multilevel light intensity distribution on an illumination pupil plane, the illumination apparatus implements K\xf6hler illumination on an illumination target surface, using as a light source the light intensity distribution formed on the illumination pupil plane on the basis of light from a light source. The malware components on a user’s computer system are identified and appropriate cure is administered in a form of cure scripts. The first device also determines that an application datagram size is larger than the defined size.