>>So, while debugger is the alleged neutral observer, it really isn't. ...
>
>Slightly off-topic, as I understand it, a "neutral observer" is impossible to achieve, according to modern physics!

Exactly - that was my point! That's why I said "alleged". I purposedly used that term because it best depicts what I think of the debugger - it's an observer, supposedly neutral, but there's no such thing as a completely neutral observer. Likewise, I think there's no neutral debugger - software may behave differently because it's being looked at.