  We present a measurement of the longitudinal spin cross section asymmetry for
deep inelastic muon-nucleon interactions with two high transverse momentum
hadrons in the final state. Two methods of event classification are used to
increase the contribution of the Photon Gluon Fusion process to above 30%. The
most effective one, based on a neural network approach, provides the
asymmetries A_p(lN->lhhX)=0.030+/-0.057+/-0.010 and
A_d(lN->lhhX)=0.070+/-0.076+/-0.010. From these values we derive an averaged
gluon polarization delta(G)/G=-0.20+/-0.28+/-0.10 at an average fraction of
nucleon momentum carried by gluons eta=0.07.
