  An energy-momentum carried by electromagnetic field produced by two
point-like charged particles is calculated. Integration region considered in
the evaluation of the bound and emitted quantities produced by all points of
world lines up to the end points at which particles' trajectories puncture an
observation hyperplane $y^0=t$. Radiative part of the energy-momentum contains,
apart from usual integrals of Larmor terms, also the sum of work done by
Lorentz forces of point-like charges acting on one another. Therefore, the
combination of wave motions (retarded Li\'enard-Wiechert solutions) leads to
the interaction between the sources.
