e backed by system memory, DB creates a
            single  file in the environment's home directory. This file
            contains information necessary to identify the system shared
            memory in use by the environment. By creating this file, DB
            enables multiple processes to share the environment.
        </p>
            <p>
            The system memory that is used is architecture-dependent. For
            example, on systems supporting X/Open-style shared memory
            inter