  A comprehensive phenomenological analysis of a two Higgs doublet model, with
flavor changing scalar currents at the tree level, called model III, is
presented. Constraints from existing experimental information especially on
(Delta F)=2 processes are systematically incorporated. Constraints emerging
from rare B-decays, Z-->b\bar b, and the \rho parameter are also examined.
Experimental implications for e^+e^- (\mu^+\mu^-)-->t\bar c+\bar t c,
t-->c\gamma(Z,g), D^0-\bar D^0, and B^0_s-\bar B^0_s oscillations, and for
e^+e^-(Z)-->b\bar s+s\bar b are investigated and experimental effort towards
these is stressed. We also emphasize the importance of clarifying the
experimental issues pertaining to Z-->b\bar b.
