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How about:RPG IV is the most current dialect of the RPG language, a high-level language that is very closely integrated with the native record-level database access on IBM midrange systems. It is unique in several respects, including a syntax totally dissimilar to that of any other high-level language (albeit modified somewhat with the "free" mode, largely derived from PL/I, that was recently added), the relative ease of calling external programs whose names are not known at compile-time, the extreme difficulty in accessing files whose names and structures are not known at compile-time, and a feature known as "The Cycle," an implicit do-while loop that can also have implicit read operations on one or more files. This "Cycle" can be tied to a designated "primary file," in which case the program implicitly reads each record of this file (and possibly also from one or more designated "secondary files"), and executes once for each primary file record, or it can be terminated by explicitly setting on a built-in logical variable, the "LR Indicator," to indicate that the program is to terminate. An RPG program can also be terminated, but left active, with its static variables preserved until the next time it is called, by explicitly RETURNing to the calling program without setting this "LR Indicator." Unlike earlier dialects of RPG, RPG IV is a part of IBM's Integrated Language Environment, a system of mutually compatible compilers in multiple languages. This allows a mixed-language application including RPG code to be statically linked into a single program, which can then execute much more quickly than an application that is constantly making external calls between multiple programs.
-- JHHL
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