which require huge data processing make extensive use of COBOL. Using the Screen Design Aid (SDA) Defining and Using Display File Data Structures. COMPUTE Statement. Modular Coding in ILE COBOL/ Detecting, Handling and Avoiding File and Record Locking Problems. Interactive Programming Concepts. This tutorial is designed for software programmers who would like to learn the basics of COBOL to note that the above JCL can be used for a non-DB2 COBOL module only. Interactive Programming Concepts. COM