of code-compatibility with Informix-4GL. Informix was acquired by IBM in April 2001. Despite its age, Informix-4GL is still widely used to develop business applications, and a sizable market exists around it due to its popularity. With accounting being an inherently text based activity, it is often chosen for its purely text-based interface to optimize data entry efficiency. These tools are available today on major flavors of UNIX and Red Hat Linux and SUSE Linux operating systems; the FOURGEN business was later acquired in 2002, by www.gillan.com. References Fourth-generation programming languages Informix-4GL