  In the Minimal Supersymmetric Standard Model, one of the scalar top quarks
can be relatively light and its couplings to Higgs bosons strongly enhanced. I
will discuss two consequences of this feature: 1) the effects of scalar top
loops on the main production mechanism of the lightest Higgs boson at the LHC,
the gluon-fusion mechanism $gg \to h$, and on the important decay channel into
two photons $h \to \gamma \gamma$; and 2) the production of the light Higgs
particle in association with top-squark pairs at proton colliders, $pp \to
\tilde{t}_1 \tilde{t}_1 h$.
