The Vision file system is the default file system used with ACUCOBOL-85 and ACUCOBOL-GT for all environments other than VMS and AMOS.
By default, AcuServer creates Vision Version 4 files. (AcuServer can be used to build and access Vision Version 2, 3, and 4 files.) Version 4 files are generated in a dual file format, with data records stored in one segment and overhead key information stored in another.
To cause AcuServer to build Vision Version 2 or Version 3 files, see the configuration variable V-VERSION in section 6.1.2.