  Using a finite-frequency recursive Green's function technique, we calculate
the dynamic magneto-conductance fluctuations and oscillations in disordered
mesoscopic normal metal systems, incorporating inter-particle Coulomb
interactions within a self-consistent potential method. In a disordered metal
wire, we observe ergodic behavior in the dynamic conductance fluctuations. At
low $\omega$, the real part of the conductance fluctuations is essentially
given by the dc universal conductance fluctuations while the imaginary part
increases linearly from zero, but for $\omega$ greater than the Thouless energy
and temperature, the fluctuations decrease as $\omega^{-1/2}$. Similar
frequency-dependent behavior is found for the Aharonov-Bohm oscillations in a
metal ring. However, the Al'tshuler-Aronov-Spivak oscillations, which
predominate at high temperatures or in rings with many channels, are strongly
suppressed at high frequencies, leading to interesting crossover effects in the
$\omega$-dependence of the magneto-conductance oscillations.
