  We review theoretical foundations and some recent progress related to the
quest of controlling the motion of charge carriers with intense laser pulses
and optical waveforms. The tools and techniques of attosecond science enable
detailed investigations of a relatively unexplored regime of nondestructive
strong-field effects. Such extremely nonlinear effects may be utilized to steer
electron motion with precisely controlled optical fields and switch electric
currents at a rate that is far beyond the capabilities of conventional
electronics.
