A lancing device is provided for use with a removable lancet. For the purpose in the present invention, voltage pulses having different polarities and sizes are applied to a pair of sustain electrodes of a plasma display panel while sustaining a discharge for the plasma display panel. There is also disclosed a method, system, computer program product andor a computer readable medium of instructions for detecting a variant of malicious software in a processing system. At least one edge indication is located within the array of clock samples.