That's a good point.
I didn't find any documentation on deployment structure. Just a few timed has been mentioned that portal-core.war is an portal implementation and default portal. So in this case what is portal-server.war ?
Would be nice to have at least brief description of portal components of jboss-portal-2.2.1RC1
Otherwise it is a very hard task to start with Portal.
Put your war file in the server/default/deploy directory. It should have some special deployment descriptors though. I have *-object.xml, jboss-app.xml, jboss-web.xml, jboss-portlet.xml. You should find some doc via google.