Along with various user interface improvements for AppleTalk setup, System 7 also included a basic file sharing server allowing any machine to publish folders to the AppleTalk network. This allowed items to be put in the trash on different volumes, each one having its own Trash. Because more than one application could run at a time, Desk Accessories were deprecated, System 7 treating them no different from other applications.
Previously this function was available through the MultiFinder in System 6, or not available at all.