# Summary of the demonstration programs and utilities

The Switching service provides the following demonstration programs and utilities both as executable programs and as source code:

Program or utility | Description
--- | ---
prt2prt | Demonstrates call transfer from an incoming line to an outgoing line and uses the Switching service to make connections, send patterns, and so on.
swish | Allows interactive or text-file-driven control of MVIP switches. It provides a convenient way to manually test connections during development to verify the commands that will be given to switches from within Natural Access applications that use the Switching service.
showcx95 | Displays switch connections for all boards that have MVIP switches.

For information about the clockdemo demonstration program, refer to the NMS OAM System User's Manual.

Before you start the demonstration programs, verify that:

- Natural Access is properly installed.

- The board is running.

- MVIP switching is correctly configured.