More to the point, what can it do that a signed 64 bit integer can't?
Now that's a much more interesting question.As to the original question, I thought that was rather obvious. It can accurately represent negative (2's complement) binary numbers so that basic arithmetic still works (plus and minus is the same operation, the same for division and multiplication) without having to be emulalted by a more complex command sequence.
As far as I know, Zenith understands binary arithmetic well enough to understand that.
As for the question regarding what an unsigned 32 bit integer can do that a signed 64 bit one can't, I wouldn't know, because that's not the position I'm argueing from!
Guess I must have read his response wrong?