A high impact resistant tool comprises a steel shank. For instance, a self-removing message is designated as such by the message’s originator, and a self-removal enhancement is added to conventional message content such as advertising before the message is transmitted over a computer network toward recipients. According to the method, fuel is injected into the combustion chamber of a cylinder in at least one injection step, the at least one injection contributing to the torque of the internal combustion engine. The electrical signal generator generates signals that are pulses that are adjustable in frequency, modulation, pulse width and amplitude with modified square waves. For example, the decrypted password may comprise a time and date field which indicates a date and time at which access will not be granted.