  Part of eikonal type contributions to $e\mu$ large-angle high-energy
scattering cross section is considered in a quasi-elastic experimental set-up.
Apart from virtual corrections we examine inelastic processes with emission of
one and two soft real photons as well as soft lepton and pion pairs. Virtual
photon contributions are given within a logarithmic accuracy. Box type Feynman
amplitudes with leptonic and hadronic vacuum polarization insertion are
considered explicitly as well as double box ones. Wherever appropriate analytic
expressions obtained are compared with those predicted by a structure function
approach.
