To disable CDE:

  o Become root
  o Stop CDE as described in the previous item in this FAQ.
  o Execute the command "/usr/dt/bin/dtconfig -d"

To enable CDE:

  o Become root
  o Start CDE as described in the previous item in this FAQ.
  o Execute the command "/usr/dt/bin/dtconfig -e"

Under the covers, what "dtconfig -d" and "dtconfig -e" actually do is
modify the file /etc/rc.config.d/desktop, which is the config file that
is read by the CDE rc script, /sbin/init.d/dtlogin.rc.