  We introduce diquarks as separable correlations in the two-quark Green's
function to facilitate the description of baryons as relativistic three-quark
bound states. These states then emerge as solutions of Bethe-Salpeter equations
for quarks and diquarks that interact via quark exchange. Approximating quark
and diquark propagators by the corresponding free ones, we calculate nucleon
static properties and form factors. For the description of production processes
off the nucleon, we consider various dressing functions for the propagators to
remove unphysical thresholds. Results for kaon photoproduction, $\gamma p\to
K\Lambda$, and associated strangeness production, $pp\to pK\Lambda$, allow us
to draw conclusions on the permissibility of different dressing functions.
