The IBM Informix 4GL Interactive Debugger is a set of tools that enables you to interact with your INFORMIX-4GL programs while they are running. You can perform the following tasks with the Debugger: quickly familiarize yourself with programs or program segments that someone else has written, determine the source of errors within your programs, and learn more about the workings of the 4GL language.The Debugger makes it easier to verify that your 4GL programs work correctly and enables you to detect and fix errors much more efficiently than with these conventional techniques. You can use the Debugger to discover the cause of both logical errors (errors that cause the program to produce undesirable results) and fatal errors (errors that prevent the program from continuing execution).The Debugger is a source language debugger. You do not need to know any programming language other than 4GL in order to use the Debugger. You can access the Debugger either from the 4GL Programmer's Environment or from the command line.