Natural is a 4GL programming language that offers interactive facilities
 for designing, developing, prototyping, testing, deploying, managing,
 and maintaining applications. Features include differentiation between
 the declaration and processing parts of a program, nonprocedural instructions,
 commands that allow graphic presentation of data, integration of PC and
 mainframe via data exchange directly from the application program, and
 a debugger that checks program flow and errors. Runs on Windows, OS/2,
 Unix, OS/400, OpenVMS, MVS, VSE, and VM.