Hm, unlike ZoneDirector WLANs in different buildings, where you can roam away from the network and come back on another part of the campus, you have a (default) 30 minute session timeout period to re-associate, or you'd be required to re-authenticate under ZD management too.
Unleashed, which is an autonomous single LAN network, will not know about your previous connections on other Unleashed networks, and I believe you will need to re-authenticate at each (new) site.