This is a very old advertisement of our (Micro Focus) first COBOL debugger called animator in all its glory debugging the classic sample of the day pi.cbl, which calculates the value of PI.
So why is so good?
To put it in some kind of context, most debuggers at the time were command line based, much like gdb, dbx but far less sophisticated. So having a debugger that actually shows the execution of flow of your, query variables, monitor variables was truly application was amazing.
I have no idea, who put this on YouTube but it really does bring back some old memories. So thank you!