Spin structure of the proton and largepTprocesses in polarizedppcollisions

QCD motivated polarized parton distributions, evolved directly in $x$ space, are used to predict rates for prompt photon and jet production at BNL RHIC and DESY HERA-$\overrightarrow{N}$ center of mass energies. Various scenarios for the polarized gluon distributions are considered and compared, and the possibility of using large $p_T$ processes in polarized $\mathrm{pp}$ collision experiments to choose between them is analyzed.