  The production of $\omega$-mesons in proton-proton collisions for proton
incident energies up to 2.2 GeV is investigated within a meson-exchange model
of hadronic interactions.
  We find a large cancellation between the dominant $\pi\rho\omega$
meson-exchange current and nucleonic current contributions. A comparison with
preliminary data from SATURNE calls for the inclusion of off-shell form factors
at the $NN\omega$ and $\pi\rho\omega$ production vertices. Due to the present
lack of knowledge of these form factors, together with the destructive
interference mentioned above, the relative magnitude of the nucleonic and
meson-exchange current contributions cannot be determined from existing total
cross section data. However, it is shown that the angular distribution of the
produced $\omega$-mesons provides an unique and clear signature of the
magnitude of these currents, thus allowing one to disentangle these two basic
reaction mechanisms.
