You can do this if you can work out the SSO issues. Jforum user ids have to be unique across all sites.
The other issue is to make sure that the different SSO users are in the correct groups and that the rights are defined so that they can't see each other's groups.
FWIW, jForum can also run multiple instances on the same server. Just use different
JDBC URLs to point to a different db, catalog, schema, or the what-ever-your-DB-calls-it...
[originally posted on jforum.net by monroe]