# Optional Tasks for Substation ES

Although executable modules have been supplied as part of the installation, you might want to change the source code. JCL and procedures have also been supplied to compile and execute sample programs. Normally, you might have to modify the JCL and procedures for use within your environment.

Changes to the source of the sample Substation ES IVPs require additional tasks as follows:

- Compiling C Programs
- Setting up an Environment for Disk Logging and Tracing
- Defining System Logger Streams

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