Thanks @Tomcat, I appreciate it. It's okay though. I don't mind nasty words or insults being thrown at me. Although I do prefer them delivered with style and substance. Sadly, that wasn't the case here 🙂
Let the guy be. Maybe there's someone else on here more tuned into his way of reasoning, suited to help him with his programming efforts. I apparently am not. Let's leave it at that.
I'm just sorry that the thread got derailed by this nonsense. Undo is an interesting and somewhat complex topic. Certainly worthy of discussion.