  First of all, we prove that open mappings in Orlicz-Sobolev classes
$W^{1,\phi}_{\rm loc}$ under the Calderon type condition on $\phi$ have the
total differential a.e. that is a generalization of the well-known theorems of
Gehring-Lehto-Menchoff in the plane and of V\"ais\"al\"a in ${\Bbb R}^n$,
$n\geqslant3$. Under the same condition on $\phi$, we show that continuous
mappings $f$ in $W^{1,\phi}_{\rm loc}$, in particular, $f\in W^{1,p}_{\rm loc}$
for $p>n-1$ have the $(N)$-property by Lusin on a.e. hyperplane. Our examples
demonstrate that the Calderon type condition is not only sufficient but also
necessary for this and, in particular, there exist homeomorphisms in
$W^{1,n-1}_{\rm loc}$ which have not the $(N)$-property with respect to the
$(n-1)$-dimensional Hausdorff measure on a.e. hyperplane. It is proved on this
base that under this condition on $\phi$ the homeomorphisms $f$ with finite
distortion in $W^{1,\phi}_{\rm loc}$ and, in particular, $f\in W^{1,p}_{\rm
loc}$ for $p>n-1$ are the so-called lower $Q$-homeomorphisms where $Q(x)$ is
equal to its outer dilatation $K_f(x)$ as well as the so-called ring
$Q_*$-homeomorphisms with $Q_*(x)=[K_{f}(x)]^{n-1}$. This makes possible to
apply our theory of the local and boundary behavior of the lower and ring
$Q$-homeomorphisms to homeomorphisms with finite distortion in the
Orlicz-Sobolev classes.
