Vrije Universiteit, Amsterdam, 1986. Similar to Modula-2, but with support for distributed programming using shared data objects, like Linda. A ' graph' data tYpe removes the need for pointers. Version for the Amoeba OS, comes with Amoeba. "Orca: A Language for Distributed Processing", H.E. Bal et al, SIGPLAN Notices 25(5):17-24 (MaY 1990).