  The influence of relativistic contributions to deuteron electrodisintegration
is systematically studied in various kinematic regions of energy and momentum
transfer. As theoretical framework the equation-of-motion and the unitarily
equivalent S-matrix approaches are used. In a (p/M)-expansion, all leading
order relativistic $\pi$-exchange contributions consistent with the Bonn OBEPQ
model are included. In addition, static heavy meson exchange currents including
boost terms, $\gamma\pi\rho/\omega$-currents, and $\Delta$-isobar contributions
are considered. Sizeable effects from the various relativistic two-body
contributions, mainly from $\pi$-exchange, have been found in inclusive form
factors and exclusive structure functions for a variety of kinematic regions.
