This variable determines the number of indexed block buffers to allocate. These buffers are used to improve the performance of indexed files. Each buffer is 512 bytes plus some overhead. Setting this number larger generally improves file performance. Setting it smaller saves memory. This value has no effect on versions of ACUCOBOL-GT which do not use Vision files. The value can range from "0" (no buffering) to "2097152". The default value is "128" for MS-DOS and "64" otherwise.