You can readily configure the ACUCOBOL-GT runtime to use an EXTFH interface for communicating with external file systems that contain indexed, relative, or sequential files. The EXTFH interface is enabled and linked into the runtime by default.
The EXTFH interface provides a way for applications to transparently access a file system such as DB2 for record storage. In transaction processing environments, EXTFH is typically used to handle data access for batch programs. For online programs, you can easily add data access methods to an application.