[en] We extend the HMRS global parton analysis to obtain a band of allowed gluon distributions with qualitatively different small x behaviour and study the implications for various processes at high energy colliders. In particular we study W and Z production as a function of collider energy. We compare predictions for the W^± charge asymmetry with recent measurements. Proceeding up to superconducting supercollider (SSC) energies we find a sizeable component of W and Z production at large rapidity which arises from a valence quark colliding with a parton with extremely small x (x < 10^-4). Finally we discuss how HERA may probe the gluon distribution at x ∼ 10^-3. (author)