Unnamed pipes are useful in applications that transfer data between related processes. They are commonly used to control the input and output of child processes by redirecting the standard input and output of the child process to a pipe controlled by the parent process.
Note: In the example code fragments that follow, error checking was left out to conserve space. Applications should always check the return code that the functions return. Control Program functions return an APIRET value. A return code of 0 indicates success. If a non-zero value is returned, an error occurred.