I worked on the same system (VM/CMS) in the 90s. We were doing the same thing, running a "guest" VM system for diagnostic use. This time it wasn't developers, but the whole Military engineering company we were working at that got shut down. My colleague "Fred" typed #CP Shutdown. All over a huge, open plan office, heads popped up, a murmur of concern rippled around and we suddenly realized what had happened. We had shut down the mainframe system upon which the whole company worked.
Solution? Just in case this (excellent) 90s system makes a comeback, ensure that the top level host login does not have "MAINT" privileges. Typing #CP Shutdown then has no effect, other than an error message. You're welcome.
Biting the hand that feeds IT
