The Portal Server product uses /opt/SUNWportal (/opt is a default that can be changed during installation), /etc/opt/SUNWportal, and /var/opt/SUNWportal for installing Portal Server specific packages and other files into the file system.
Most Portal Server Java classes are defined in packages under the com.sun.portal package name.
The Portal Server is installed as web application portal on the /portal URI in the web container.