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 <email@example.com> et al, SIGPLAN Notices 25(5):17-24 (May 1990).