  It has been shown recently that the amplitude of the creation of $n$ real
scalar particles by one virtual boson near $n$--particle threshold exhibits
exponential behavior at $n\sim1/\lambda$. We extend this result to the
processes of multiparticle production at threshold by two virtual bosons. We
find that both the tree--level amplitude and leading--$n$ loop corrections have
the same exponential behavior, with the common exponent for $1\to n$ and $2\to
n$ processes, for various kinematics. This result strongly indicates that the
exponent for multiparticle amplitudes is independent of the initial state and
that there may exist a semiclassical approach to the study of multiparticle
production.
