MultipleAccountLogins
From SqueezeboxWiki
A plugin that provides LDAP query of username and password for access to squeezecenter. Could work with Active Directory or Open Directory. Would need to specify settings to connect to LDAP datasource. Additionally the plugin could create tables in the squeezecenter for storing usernames and passwords.
Each user would only be able control their instance of a slimplayer or softsqueeze based on the MAC address when they login.