A method for programming PMOS single transistor flash memory cells through channel hot carrier induced hot electron injection mechanism is disclosed. Further, light absorbing portions 12 are disposed in the grooves betweenadjacent unit lens portions 11 to absorb andor shield external light incident from a light outgoing side. The tested animal is placed in the liquid body such that movement of the tested animal in the liquid body results in surface waves of the liquid body and that the upper, detected portion moves according to the surface waves reaching the lower float portion. The local block unit determines which ones of the identified processors are present in the computer system and generates an invalidation message for each present processor for transfer thereto.