  The effective $\eta^\prime g^* g^*$ vertex is studied in the standard
(Brodsky-Lepage) and modified hard scattering approaches for arbitrary gluon
virtualities in the time-like and space-like regions. The contribution of the
gluons in the $\eta^\prime$-meson is taken into account, and the wave-function
is constrained using data on the electromagnetic transition form factor of the
$\eta^\prime$ meson. Our results have implications for the inclusive decay $B
\to \eta^\prime X$ and exclusive decays, such as $B \to \eta^\prime (K, K^*)$,
and in hadronic production processes $N + N (\bar N) \to \eta^\prime X$.
