  We study the properties of charmed, nonstrange, $\rm D$ mesons produced in
continuum $\rm {e^+}{e^-}$ annihilations. The $ \rm {e^+}{e^-}$ collisions were
generated in the energy region of the $ \rm \Upsilon(3S)$ and $ \rm
\Upsilon(4S)$ resonances by the Cornell Electron Storage Ring, and were
analyzed by the CLEO detector. We make extensive study of the decay topology
$\rm D^0, D^+ \rightarrow \overline{{\rm K}}^{_{_0}}X$, where the
$\overline{{\rm K}}^{_{_0}}$ is observed in the final state $\rm K^{0}_{S}
\rightarrow \pi^+\pi^-$. The decay $ \rm D^+ \rightarrow K^- \pi^+\pi^-$ is
also considered. We analyze the hadronization process through which charmed
quarks become charmed hadrons. We measure the probability that a charmed meson
will be produced in a state of non zero angular momentum. A comparison of the
$\rm D^0$ and $\rm D^+$ fragmentation distributions is made to different
fragmentation models, and to other charmed hadrons. A measurement of the
relative production of several $\rm D^+$ decay modes is made, and the total
$\rm D^0$ and $\rm D^+$ cross sections are estimated. Techniques are presented
for the analysis of satellite mass peaks and $\rm D^+ \Leftrightarrow
D^{+}_{s}$ reflections. We search for nonspectator effects in the weak decays
of charmed mesons, and for evidence of hadronic final state interactions in
$\rm D^0$ decay.
