Thanks for further reply.
As you say, neither CTRL+C nor CTRL+BREAK work in Windows DOSBox. I had not tried it before but just tried and you are right. It would have been nice to have a BAT Exit facility in Magic DOSBox but it is not essential so please get on with your more important things. I read your links but did not really understand them.
Looking forward to trying your next Ver with the system independent transparent keyboard.
Thanks for all your hard work.