The ACUCOBOL-GT runtime on UNIX platforms can call most third-party sort modules that support the EXTSM interface to perform SORT and MERGE operations. The EXTSM call interface allows you to substitute other sort modules that may enhance performance or offer more flexibility for sort features.
Sort modules can perform file handling using the EXTFH interface, which the ACUCOBOL-GT Runtime makes available to third-party sort modules. The sort module may also interface directly with the Vision library.