  The inclusive production of high-p_\perp particles (pions) in the beam
fragmentation regions of high-energy hadronic collisions is driven by the
breakup of valence constituents of the beam hadrons into their two-body
Fock-state components,and their subsequent fragmentation. We briefly discuss an
approach, that allows the consistent inclusion of intrinsic and radiatively
generated transverse momenta of initial state partons, and describe an
extension of our approach to nuclear targets.
