The break key from any emulator I choose does not interrupt programs or UniQuery commands.  The only thing is display "yo" with diacritical marks if at an input prompt.

I just do support for existing clients.  I have recently upgraded from a very old mvBase server to UniData on Win10.  I noticed ^C was not interrupting my programs, but I figured it was a emulator setting I could find later.  Well, this is later, and I cannot figure out how to allow interrupts in UniBasic programs.  I don't see any setting that would prevent this.

I have tried changing the default Break Key (in Dynamic Connect) to another character.  I have tried compiling with -D.  I have tried another emulator.
I have tied never making a mistake in a program so it doesn't get into an endless loop.  But that doesn't always happen.  Then I have to figure out which of my many terminal emulators with the same user and port status (DC doesn't help) I need to kill with a stopudt or deleteuser command.