[Building Sakai] Check CAS on initial access

[carl.hall at et.gatech.edu]

Is there a way to check a CAS ticket when a user first accesses a Sakai instance?  We're beginning to setup with a campus SSO and would like our users to not have to click login only to be rerouted to their own Workspace (assuming they've logged into some other campus service) but to be taken to their Workspace directly on first access or the guest Workspace if not authenticated.