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Another need for program comparison involves production programs that are used in sensitive applications, such as payroll and accounts receivable. By using the Program Comparison display (5.3), you can detect any unauthorized changes or clandestine code hidden in the program.
Inadequate change and system implementation procedures can seriously impact the data center when the situation involves key system or production programs. For instance, it is entirely possible for a load module and source program to have the same name, yet the load module was not necessarily created from the corresponding source program. However, you can determine if the load module corresponds to the source program by using the Program Correlation Display (5.6) to verify that the source program does indeed exist. Once this is accomplished, you can compile and link edit the source program into a new load module. The new load module can then be compared to the load module in question by using the Program Comparison display to determine if they are one and the same.
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