Session can be started from the $HOME/.xsession
in last command line
as exec /opt/NsCDE/bin/nscde or
ssh-agent nscde or with gpg-agent,
lxsession or whatever.
If supported by the X Display Manager which is in use on the target system, an xsession
file /opt/NsCDE/share/doc/examples/xsession-integration/nscde.desktop
will be put by Installer.ksh during the installation into
/usr/share/xsessions
(or in whatever place your system and your X Display Manager reads this files)
and afterwards NsCDE can be selected from the display manager's menu or similar
session selector. See the rest of the X Session Manager integration examples in the
directory /opt/NsCDE/share/doc/examples/
for MATE, KDE, LXDE and similar DE integrations and play with this if you like.