I described it as an obsecure OS. But the Guy was well aware of it. And had this interesting reply…
BLIS/COBOL was a popular 3rd-party operating system/language used by
VARS [Value Added Resellers] for end-user applications. In fact, one of
our clients was using IPI's [Information Processing, Inc.] Nova
Blis/COBOL through the 2010s (using our Nova virtual machine emulator)
on a PC.