1. Without executing a COBOL program, you can see the output by reviewing the program's logic and the expected data flow, or by using a tool like a code analyzer or static code analysis tool.
2. To rename an input filename and output filename in COBOL, you can modify the `SELECT` statement in the Environment Division to specify the new filenames.
3. A flag is a variable used to indicate a condition or state, often used in control structures to determine the flow of execution.
4. Impact analysis is the process of assessing the effects of a change in a system. Test cases are written based on the areas affected by the change, focusing on functionality, performance, and integration points.
5. To see the output of a CICS command, you can use the CICS Transaction Gateway or CICS Explorer, which allows you to view the results of transactions and commands.
6. Datasets are concatenated in COBOL by specifying multiple dataset names in the `SELECT` statement,