  XMM-Newton has been performing comprehensive studies of X-ray luminous RS CVn
binary systems in its calibration and guaranteed time programs. We present
results from ongoing investigations in the context of a systematic study of
coronal emission from RS CVns. We concentrate here on coronal abundances and
investigate the abundance pattern in RS CVn binaries as a function of activity
and average temperature. We find a transition from an Inverse First Ionization
Potential (FIP) effect towards an absence of a clear trend (no FIP) in
intermediately active RS CVn systems. This scheme fits well into the long-term
evolution from an IFIP to a FIP effect found in solar analogs. We further study
variations in the elemental abundances during a large flare.
