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Processes were the active elements in the system; they contained executing programs. Processes were composed of subprocesses (protection domains, performing a function similar to rings in Multics). One subprocess within the process was designated as the root. All other subprocesses within the process had a father, forming a subprocess tree. Each subprocess had a name (class code, see later), a local C-list and a map. The map translated a logical memory address into a file address.

Paul McJones