  A computer study is performed to estimate the influence of the small-$k_T$
region in the BFKL evolution equation. We consider the small-x region of the
deep inelastic structure function $F_2$ and show that the magnitude of the
small-$k_T$ region depends on $Q^2$ and $x_B$. We suggest that the width of the
$\log k_T^2$-distribution in the final state may serve as an additional
footprint of BFKL dynamics. For diffractive dissociation it is shown that the
contribution of the infrared region is large - even for large $Q^2$. This
contribution becomes smaller only if restrictions on the final state are
imposed.
