CICS or Customer Information Control System as it was once known, now pronounced “kicks” is a transaction delivery platform for the mainframe. I have been working with it for 30 years or so. Recently it has been extended again, this time to support requests from PHP programs. Wow.
YouTube offers some related videos at the end of each video. The choice below was offered.
Unrelated to CICS or PHP (or perhaps I do not really grok either one). But you may recognize parts of it:
The scene from Pi is especially well remembered. One of our favorite movies here.