# Usage Samples

Substation ES contains fully functional C and COBOL code samples on how to call and use HVT.

The code samples can help you test and understand how HVT operates. They are listed as follows:

- The COBOL program SXCCI032: the associated copybook is SXCCTDQW. The transaction SXTF invokes this program.
- The C program SXC3I032: the associated header file is SXCHTDQW. The transaction SXT6 invokes this program.

Copyright © TIBCO Software Inc. All rights reserved.