Specify a full procedural file (F in position 18 of the file description specifications) to control all or partial input of a program. A full procedural file indicates that input is controlled by program-specified calculation operations (for example, READ, CHAIN). When both full procedural files and a primary file (P in position 18 of the file description specifications) are specified in a program, some of the input is controlled by the program, and other input is controlled by the cycle. Even if the program cycle exists in your module, all the processing of a full-procedural file is done in your calculations.
The file operation codes can be used for program control of input. These file operation codes are discussed in File Operations.
