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UCX: Callable FTP

The Question is:

How do we invoke FTP from a C program?

We have written a C program that uses the instruction

SYSTEM("@FTP_COMMAND_FILE.COM P1 P2 P3");

The command file performs FTP GET operations against
the node given in P1.

This works well but the command SYSTEM takes a lot of CPU
power when a new subprocess is created for every FTP operation.

Is there a better way to invoke FTP from a C program then described
above? We are using UCX033 for TCP/IP communication.

The Answer is:

   Create and maintain a subprocess specifying mailboxes as the input
   and output devices, and pass ftp and DCL commands to the subprocess
   via mailbox messages.  (In this case, the output does not appear to
   be of particular interest, and can be discarded.)

   Use of $qio and/or $qiow calls is common practice when performing
   this task.