  The azimuthal asymmetry and the transverse momentum of forward produced
charged hadrons in deep inelastic muon scattering have been studied as a
function of the event kinematics and of the hadron variables. Primordial $k_T$
of the struck parton and O($\alpha_s$) corrections to the cross-section are
expected to contribute to the transverse momentum and the azimuthal asymmetry
of hadrons. The data show some unexpected dependences not present in a Monte
Carlo simulation which includes the theoretical parton-level azimuthal
asymmetry.
